Gas boiler Navien: faults and their elimination

A dependable gas boiler is your best friend in the winter months when it comes to keeping your house warm and comfortable. Navien has established a reputation for efficiency and performance among the many brands available. Navien gas boilers are susceptible to malfunctions, just like any other mechanical system. It’s possible to prevent expensive repairs and cold nights by being aware of these possible problems and knowing how to solve them.

Gas boilers made by Navien are well known for their cutting-edge construction and energy-efficient features. They efficiently heat your house and provide hot water when you need it thanks to cutting-edge technology. Even the best-built boilers can eventually develop problems despite their dependability. Your Navien boiler will continue to run smoothly if you know how to troubleshoot common problems, which can range from small hiccups to more serious malfunctions.

The most frequent issues with Navien gas boilers are a decrease in heating efficiency or erratic hot water delivery. There could be a number of reasons for this, including mineral accumulation in the system, broken parts, or incorrect installation. Finding the source of the problem is essential to applying the right fix and getting your boiler back to working order.

Another frequent issue faced by Navien boiler owners is the occurrence of error codes on the unit"s display panel. These codes are designed to alert homeowners to specific problems within the system, such as low water pressure, ignition failure, or sensor malfunctions. Understanding what each code indicates and how to respond accordingly can help you address the issue swiftly and effectively.

Certain boiler malfunctions can be fixed with basic troubleshooting techniques, but others might need for expert assistance. Without the requisite knowledge, attempting to fix complicated problems may exacerbate them and require more expensive fixes in the future. Understanding common issues and how to fix them will help you take preventative action to keep your Navien gas boiler operating efficiently and lasting a long time.

The principle of operation of the Navien boiler

The principles of operation of modern gas boilers are practically the same in all manufacturers, the only differences are in the equipment configuration and the internal location of the actuating mechanisms. The scheme of water flow in the boiler is shown in the figures. Navien boiler works either to maintain the desired temperature in the CO, when the heated water from the first heat exchanger is pumped by a circulation pump on a large circle, or in the mode of preparation of DHW. DHW mode is a priority, it means that when you need to heat water, a special three-way valve switches the circulation to the plate heat exchanger DHW, the flow of coolant on the heating circuit is closed off at the same time. The signal for switching the boiler to the DHW preparation mode comes from the flow sensor located on the hydraulic unit with the make-up tap.

Features

Boilers made by Navien are becoming more and more significant in the Russian market. Their technical characteristics are comparable to those of their more expensive Western European counterparts, but their solutions are more affordable.

These products’ distinguishing characteristics are:

• excellent assembly;
• high reliability and stability of operation;
• presence in the range of only two-circuit models;
• possibility to choose between atmospheric devices and products with forced draught;
• availability of systems compatible with the coaxial chimney, as well as versions that provide for its separate execution.

South Korean boilers are outfitted with two independent heat exchangers, one handling the water circuit and the other the heating circuit. Both are composed of grades of stainless steel.

Crucially, every primary component is produced internally. Consequently, the issue of component incompatibility is resolved, and their stable interaction is ensured.

Because of the way electronics are built and operated, unexpected voltage spikes don’t have harmful effects. Separate German boilers with an equivalent degree of security are available, but they are priced entirely differently.

Because the Russian power grids are too unstable, it is preferable to connect the South Korean boilers Navien using a voltage stabilizer. The heating units themselves have a remote monitor that displays the codes associated with specific malfunctions.

Additionally, the user will receive timely information regarding system operation modes and fluid and air temperature settings. There is always a sensor used to detect the room’s temperature. If you select a system from a different manufacturer, this type of indication is almost always only available on request and for a different price.

The main blocks of the boiler NAVIEN 24 and their functions

It is important to comprehend how a gas boiler Navien Ace 24 k functions before attempting to identify any faults, no matter how minor or major. There are two circuits and a closed combustion chamber in the gas boiler company Napoleon Ace. The combustion product outlet and air inlet are situated apart. Through a separate chimney, air is drawn from the street and the exhaust is returned to it. Consequently, it is preferable to become well-versed in gas boiler Navien before making a purchase as the price is generally commensurate with the quality.

Fundamental components of the Navien 24 boiler:

• Main heat exchanger. The water circulating in the heating system passes through it, is heated and supplied to the circuit. When the DHW is switched on, the three-way valve is switched, and hot water is supplied for household needs. The water flow rate is compensated with water from the water supply network and the command is given by the hot water flow rate sensor. A modulating gas burner is installed for accelerated heating of the hot water. One of the faults is the formation of scale in the heat exchanger. To repair the boiler, you need to remove the heat exchanger and remove scale with citric acid. Removing the heat exchanger is difficult and requires some skill. In addition, if the boiler is under warranty, such an operation will terminate the warranty service.
• Fan. Its main purpose is to create an optimal mixture of air with gas for normal and complete combustion of gas.
• . The purpose of the built-in circulation pump – to ensure the movement of the coolant in the heating circuit.
• Gas unit. Gas is supplied to the modulating gas valve, which carries out on commands from the control unit gas supply to the burner.
• Three-way valve. Such a valve can operate in two modes – mixing and separating valve. It is installed if there is a need to separate the fluid flow into two directions, or to mix two flows.
• Expansion tank. The expansion tank built into the NAVIEN 24 boiler compensates for the increase in the volume of water during heating of the combustion chamber.
• Air pressure switch (diff. Relay). Pressostat (another name) is used to control the boiler fan and smoke extraction process. Authorizes the burner to operate.
• Heating temperature sensor. Determines the temperature of the water coming out of the heat exchanger.
• Ignition transformer. Creates a high-voltage impulse to generate a spark between the electrode and the housing to ignite the gas.
• DHW heat exchanger. Heats water from the water system for "make-up" when turning on the water for DHW.
• Burner. Under the control of the electronic unit with the help of the gas valve gas is supplied to the burner for modulation in accordance with the laid algorithm.
• Gas supply tube with holder. Gas tube brings gas from the controlled gas valve to the burner.
• Control unit. Electronic unit starts, monitors, and in case of emergency cuts off the gas and stops the operation of the boiler. The unit is equipped with LCD display, it shows error codes. Instruction manual for Navien wall-mounted two-circuit gas boiler lists faults in the form of codes, which are shown on the LCD display.

Device and main elements of the boiler

Knowing your boiler well is essential to carrying out the easiest maintenance tasks. The housing houses the following major components, though exact models may differ: combustion chamber, heat exchanger, expansion tank, gas burner, circulation pump, and control unit.

• combustion chamber;
• heat exchanger;
• expansion tank;
• gas burner;
• circulation pump;
• control unit.

The lower section of the case needs special attention because this is where the connections between the inputs and outputs of the circuits are made, along with other crucial details.

Diagram of the Navien boiler

Four connection sockets are located closer to the wall:

1. Supply inlet.
2. Return inlet (with safety valve).
3. Hot water supply outlet.
4. Cold water.

Beyond that is a tiny gas supply pipe.

There is a drain plug and a hot water filter located closer to the return inlet.

A make-up tap, which is used to fill the system with water, comes before the DHW outlet.

Operating principle of the anti-freeze system. A pump that drives the coolant and keeps it from freezing is activated automatically when the temperature in the pipes falls below -10°.

The burner is turned on and the water is heated to +21° if the temperature drops further, to -6°.

Troubleshooting step-by-step instructions

01 – A minor pump unit malfunction or a blockage in the water supply system may be the cause of this malfunction.

To remedy, take the following actions:

• Drain the water, clean the filters from dirt and small particles;
• Make sure that the pump, main assemblies, contacts are in good working order;
• Inspect the air screw, and if deformation is noticed, correct it.

02: only warm water comes from the tap, followed by cold water, and is characterized by a brief hot water supply. The display shows a sharp rise and fall in temperature, but the heating system is still functioning normally. This may happen for a number of objective reasons:

• From the occurrence of an air lock;
• From insufficient incoming water flow;
• Pumping equipment inoperable due to impeller failure;
• The sensor that determines the pressure in the system has failed;
• Redistributing valve is in closed state.

The necessary pressure can be changed to fix this error. To do this:

• Drain the water from the heating appliances;
• Check the pump, fix the impeller, coil;
• Set the redistributing valve to the "open" position;
• Check sensor contacts;
• Clean debris from the sensor arrow.

The most common cause of this overheating in boilers is air blockages.

10-This could be shown if:

• When ventilation equipment is not working properly;
• Due to incorrect installation of the sensor indicating the pressure of the supplied air;
• Due to clogging of the chimney equipment;
• In case of strong winds.

Here are the steps you must take to fix it:

• Fix or put in a new fan;
• Clean the chimney construction.

The boiler is rumbling and making an unusual noise, but there is no information on the display. Poor quality fuel or a clogged water line are the most common causes of this. You must either fully disassemble or thoroughly clean the system in order to fix it.

011: The boiler’s water supply pipes are not entirely full. It is time to remove the air lock.

Models

Of course, understanding the system’s general features won’t be sufficient. It is important to comprehend the particulars of each version as well. As a result, the manufacturer claims that "Ace K 13" skillfully blends aesthetic and practical concerns. A range of people experienced the need for the model during its development, and with the help of experts, it was possible to create a true leader in the price range.

This modification is exported to many nations in Asia and Europe, where it primarily elicits positive feelings. The designers’ overarching goal was to give contemporary appliances the maximum degree of dependability possible.

According to the manufacturer, this boiler should only be placed in rooms that are at least 130 square meters in size. м.

When using a closed furnace, you can decline to use specific boiler rooms and install the following device:

• bathrooms;
• in kitchens;
• in bathrooms;
• in other rooms of the house by choice.

Even in extremely cold weather outside the window, the boiler will confidently heat the house. It cannot be hampered by low water quality or mains supply power spikes. Should there be any malfunctions, the service center’s assistance won’t wait around. The freezing of coolant at the onset of cold weather, a problem common to the Russian climate, has been resolved.

1.33 cubic meters will be used up in an hour. m of natural gas or 1.16 kg of liquefied gas, and the plumbing circuit will receive water that is between 40 and 80 degrees while the coolant is heated to 30 to 60 degrees.

An even more potent version is the floor boiler "Ace 24." It closely adheres to the ISO 9001 standard’s requirements in the production of every component. Like the previous version, the boiler is built on a turbine scheme, so it doesn’t require a special room.

The supercharging system that has been installed is modulating, meaning that it only runs when necessary. The efficiency and fuel utilization were both improved by the integrated fan.

Main characteristic

Korean producers released a wide range of heating systems, considering the convenience of their customers. The apparatus is distinguished by its exceptional dependability and reasonable cost. Boilers made by Navien Gas: Features

1. The appliance is equipped with a regulation scheme, which avoids problems associated with voltage fluctuations in the network. This feature protects the system from breakdowns in case of false start of sensors. This feature is very useful because the voltage in the power grid is not always stable.
2. The heating system is able to stabilize its operation when the supply pressure is reduced to 4 bar.
3. The unit does not freeze even in the absence of gas supply. There is a pump for forced water circulation.
4. The system has a double heat exchanger designed to heat the coolant and water. Preheating can be programmed.
5. The electronics are characterized by simplicity and convenience.

Varieties of equipment

Among the many products offered by Navien are wall- and floor-mounted devices. Even with an erratic fuel and electricity supply, units can continue to operate normally. The models come with a frost protection system and a turbo boost feature.

Floor equipment is perfect for homes in the country. It provides hot water and heats the space qualitatively. The units are small and straightforward. There is condensing equipment on hand. The cost of heating the house is greatly decreased by these units.

Popular Navien models include the following ones: Ace is available in Deluxe, Prime, and 16 k or 20 k power levels.

The company manufactures equipment with single and dual circuits.

New Deluxe model

The newest heating system, the Navien Delux, took the place of the Ace. This model features a turbine for forced smoke extraction in addition to a closed combustion chamber. Features of the equipment:

1. Increased frost protection. At -6°C the automatic burner is activated, and at -10°C the circulation pump is activated, allowing the coolant to move continuously.
2. Fan with adjustable speed. Turbine speed changes depending on the air pressure sensor reading.
3. The heating system is made of stainless steel, which is characterized by a much longer operating life compared to other materials.
4. Protection from the impact of voltage fluctuations in the network and the ability to operate at low water and coolant pressure.

It’s interesting to note that Navien systems lack an integrated control display.

Every task is completed using a different remote control. Along with various information about the device’s current condition, such as error codes and malfunctions, it also shows a temperature indicator.

Additionally, there is an air pressure sensor that not only senses the presence of draught but also alerts the control panel to reverse draughts and transmits data for batch control.

The gas will not flow to the burner and the boiler will momentarily shut off if the chimney pressure is too high.

Troubleshooting of some boiler problems

Like any equipment, even the most dependable ones, Navien boilers can malfunction from time to time. Some of these issues can be fixed by the device’s owner on their own.

Prior to anything else, it’s critical to identify what caused the breakdown. The error code data is displayed on the display by the self-diagnostic system so that the owner can promptly identify the issue and take appropriate action.

To enable prompt and appropriate action by the owner, the self-diagnostic system provides data along with an error code on the display.

The Navien boiler fault codes are as follows:

• 01e – the equipment has overheated.
• 02e – little water in the heating / flow sensor circuit is broken.
• 03e – no flame signal: it may not be present or there may be a problem with the corresponding sensor.
• 04e – false flame data / short circuit in the flame sensor.
• 05e – problems with the heating water t sensor.
• 06e – short circuit in the heating water t sensor.
• 07e – problems with the sensor t hot water supply.
• 08e – short-circuit in the sensor of hot water supply t.
• 09e – problem with the fan.
• 10e – problem with smoke removal.
• 12e – flame went out during operation.
• 13e – short circuit in the heating flow sensor.
• 14e – no gas supply.
• 15e – problem with the control board.
• 16e – boiler is overheated.
• 17e – error with DIP-switch.
• 18e – smoke removal sensor overheated.
• 27e – problem with air pressure sensor (open or short circuit).

Error 01e

Equipment overheating can happen when the circulation pump malfunctions or when a blockage causes the ducts to narrow.

What you are capable of doing:

1. Examine the circulation pump impeller for impeller damage.
2. Check if there is resistance in the pump coil, if there is no short circuit.
3. Check the heating system for air. If there is air, it must be vented.

02е

If there is air in the system, low water, a damaged circulation pump impeller, a closed distribution valve, or a malfunctioning flow sensor, the boiler may issue a low coolant error.

What is actionable:

1. Bleed the air.
2. Adjust pressure.
3. Check if there is resistance in the pump coil, no short circuit.
4. Open the distribution valve.
5. Check the flow sensor – whether there is no short circuit in it, whether there is resistance.
6. Open the sensor housing, clean the flag (moving mechanism with magnet).

The hot water system’s air presence is typically the cause of the issue.

03е

Not a flame signal. Possible causes for this include:

1. Breakage of the ionization sensor.
2. No gas.
3. No ignition.
4. The tap is closed.
5. Boiler grounding is defective.

The flame sensor’s obstruction needs to be cleaned. Apply fine sandpaper to the electrode to remove any grayscale.

05е

What is actionable:

1. Check the resistance on the entire circuit from the controller to the sensor. If the problem is found, replace the sensor.
2. Disconnect and reconnect the connectors of the controller and the sensor.

10е

Issues with smoke extraction could be brought on by a broken fan, bent sensor tubes, or incorrect fan-to-sensor connections. Furthermore, there can be an obstruction in the chimney or a sudden, powerful wind gust.

What is actionable:

1. Repair the fan or replace it.
2. Check the correct connection of the sensor tubes.
3. Clean the chimney from blockages.

11е

Issue with the water fill sensor: this error message is only displayed for European boilers that have the necessary sensors installed.

13е

The heating water flow sensor needs to be replaced if it has shorted out. The cost is 900 rubles.

Noise and hum

It can happen that the appliance is making an unusual noise or humming, even though there is no error shown on the display. This may occur when scale, overheating, or boiling causes the water to become difficult to flow through the tubes. A defective heating medium could be the source.

Method for resolving the issue:

1. The problem can be eliminated by disassembling the unit and cleaning the heat exchanger. If this fails, the part must be replaced.
2. You should also check the taps to see if they are open to maximum.
3. Make the water temperature lower. The boiler output may be excessive for the pipe to which it is connected.

No hot water

It occurs that although the boiler heats the water as it should, the DHW water is no longer heated. There is a three-way valve issue. Cleanings and repairs won’t cut it; a new part is required! The valves have been functioning properly for the past four years, so the issue is not unusual.

Thus, Navien boilers are dependable and affordable machinery. Even in situations where service specialists are not involved, problems can be resolved with appropriate operation and a competent approach to the challenges encountered.

Rules of operation and timely maintenance

When purchasing a gas heating unit for your home or apartment, keep in mind that contemporary gadgets are intricate, sophisticated, heavily automated, and equipped with safety features. Therefore, it is essential to abide by certain operating guidelines in order to prolong the boiler’s lifespan and avoid its premature failure.

1. Firstly, it is installation in accordance with the established requirements, according to the scheme recommended by the manufacturer, and not on the basis of advice from a familiar handyman.
2. Secondly, it is quality materials and components: savings at this stage threatens to grow into financial costs for repair of the boiler in the future.
3. Third, it is a thorough check of the state of the sensors, chimney, water/gas supply before starting the boiler. Inspection and cleaning of the main components should be carried out regularly, and not on an ad hoc basis.

Automated messages with coded content will appear on the display indicating probable causes of malfunctions. Based on past performance, it is likely that following these suggestions will help prevent major malfunctions and breakdowns. As a result, the owners won’t have to investigate the typical problems with their Navienace boiler or what needs to be done to fix them.

Self-diagnosis of Navien boilers

Protection systems and automatic self-diagnostic systems work together to stop major malfunctions before they start. When the electronics detect a problem, they turn off the machinery and show the code on the LCD screens or indicators. Troubleshooting is a little trickier when self-diagnostics aren’t present, but overall, the internal component checking algorithm is pretty much the same.

In Navien boilers with electronics, self-diagnostics facilitates the identification of gas equipment malfunctions. Numerous sensors and nodes are questioned, the results are analyzed, and the information is stored in the internal memory. Critical errors appear on the indicators right away. Systems that self-diagnose were initially intended for specialists. But nothing stops you from fixing the Navien technique on your own if you have straight hands and at least a little boiler repair experience.

Make sure the warranty has expired on Navien boilers before attempting any DIY repairs. Give the service center a call if the device is still covered by warranty; the repair will be covered at no cost to you.

Frequently occurring faults

The instruction manual includes a list of the most frequently resolved issues that arise when using the boiler, so that the user can easily identify any malfunctions with the device. Many of them can be fixed without the assistance of experts if you do it yourself. The majority of them may result from incorrect equipment installation, improper operating procedures, or low-quality fuel supplied to the boiler.

The device’s display can quickly identify the issue; the following is a list of the most typical issues:

• 01 – equipment overheated;
• 02 – low power of fuel supply, the sensor does not operate;
• 03 – no information about fuel ignition in the boiler;
• 04 – false operation of the combustion sensor;
• 05 – the circuit of the sensor-indicator for the heating temperature has been interrupted;
• 06 – another malfunction with the temperature indicator sensor;
• 07 – temperature sensor damage;
• 08 – the hot water supply appliance has failed;
• 09 – ventilation malfunction;
• 10 – faulty chimney;
• 11 – the heating system coolant is not completely filled;
• 13 – short circuit in the sensor circuit;
• 15e – operation of the heating system is completely faulty;
• 27 – the pressure of the supplied air flow is not satisfactory.

Design features

Because they are made for home use, boilers are ideal for heating apartments or rural homes. excellent at heating the water for domestic use and the heating system. The device’s enclosed manual and all of its inscriptions are in Russian, so you won’t be able to get lost while adjusting and using it.

Gas and water pressure sensors are included, which greatly reduces gas consumption and guarantees the stability of the system. The tiny gadget controls the flow of gas into the burner at the proper pressure, enabling full combustion without the production of soot.

The built-in fan ensures the uniformity of the combustion process, while at the same time providing access to air for complete combustion of the fuel.

Finalization:

• Circulating pump;
• Separate heat exchange equipment;
• Accumulation tank;
• Automatic thermal equipment;
• Functional timer device.

Depending on the situation, heating equipment can operate on either liquefied gas or natural gas. With a thermometer, you can program it to operate in a convenient heating mode. For instance, you can program it to turn on and off every 30 minutes for half an hour. You can also program it to operate in a similar manner for four hours by setting the mode to number 4. If you are planning to leave the house, it is convenient and doesn’t require sinking.

A two-circuit system can be used to heat the house and separate technical water. Certain designs can also function in the secondary circuit mode, which is useful when heating is not required and hot water is needed for household needs, such as during the warm season.

While some models have their own reservoir that is heated and fed to supply the body, others can only be started by opening a solid water supply to the system.

Advantages and disadvantages:

• The performance of the device is preserved even at lower temperature values. Installed frost protection keeps the boiler in working condition;
• Circulation pumping device works in automatic mode, it starts the device when the temperature drops to 10 degrees Celsius, which will not allow the water to freeze and destroy all the heating equipment;
• When the temperature of the coolant drops to 6 degrees, the combustion system is automatically activated, and provides heating up to about 20 degrees Celsius;
• The appliance does not require additional insulation measures, Therefore, it can be installed in completely unheated rooms (basements, outbuildings);
• When the temperature drops to a preset value, the burner automatically switches on, ensuring even heating of the home heating systems;
• Significant fuel savings – is achieved by starting the reverse stroke, which allows the gas supply to be used economically and keeps all the main components of the boiler operational for a long time, thanks to the clever setting of the start-up and shut-down cycles. They have proven themselves in low-pressure conditions;
• The fan device regulates the supply of the required amount of air, which increases the efficiency of the boiler, due to the complete combustion of the fuel supplied and reducing heat loss by the device.

This brand’s boilers are all constructed from alloyed stainless steel heat-exchange equipment and heat-resistant materials.

Repair

For a number of reasons, even equipment as dependable as a Navien gas boiler can malfunction. Even if the owner chooses not to do any repairs themselves, knowing how to fix it is still essential since having control over the work of experts is also highly beneficial. Furthermore, many equipment flaws are fixable with a few easy steps. A few of them have already been covered. Even if a measure isn’t specifically prohibited, you should never take it without first consulting the manual.

Error #1 is thought to occur when:

• Carefully inspect the pump and check the impeller;
• assess the condition of the electrical system;
• clean the dirt out of the filter;
• vent excess air.

Sometimes the "02" signal can be used to correct the situation by opening the closed distribution valve. The flag on the sensor can be cleaned, which is also very helpful. You can use fine-grit sandpaper to clear the clogged flame sensor. Error "10" is frequently fixed by cleaning the chimney and inspecting and troubleshooting the contacts in the meter’s tubes.

When adding coolant to the system, you should do the following to reduce risk:

• Before refueling, disconnect the appliances from the power supply and close the gas;
• Check the position of the valves and open them as far as they will go;
• open the make-up valve to the left;
• close it as soon as the pressure gauge detects a pressure of 1.5-2 bar;
• If the emergency devices are activated, it is necessary to drain the water and start from scratch.

The most common cause of strange noise that happens randomly and doesn’t show a code on the screen is a pipeline capacity drop. Therefore, descaling in addition to draining the old coolant and adding a fresh portion is the best way to remove such a malfunction.

Furthermore, it is advised to lower the heating fluid’s temperature and confirm that the installed boiler’s power is not excessive.

Crucial: even for individuals with specialized training, tampering with electronic circuits in the event of a malfunction is not permitted. Replacement spare parts, even small ones like the three-way valve, should only be bought from the South Korean company’s authorized dealers.

Turn off the gas and water supplies as well as the electricity before opening the cover.

Replace the fan in the following order:

• Disconnect the gas supply line;
• the hose connecting the fan and the air sensor is removed;
• disconnect the two connectors that link the unit to the control system;
• unscrew the 3 screws and remove the fan;
• Install a new unit (or return the old unit after service);
• repeat all the operations just described in the opposite sequence.

The primary heat exchanger starts to alter, eliminating:

• the gas supply pipe;
• transformer that sets the current for ignition;
• fan;
• excessive heating detector.

After removing each of these components, take out the smoke collector, furnace, and grounding. The heat exchanger must then be connected to the furnace body as a whole by unscrewing the screws holding the cover on. All manipulations are repeated with the opposite sign after the unit is replaced in the exact same manner, and the boiler is then turned on.

For information, heat exchangers that have been cleaned and appear to be in good condition can be replaced. The only exception would be in the event that the ceramic seal’s integrity was jeopardized.

Error 02 Insufficient water in the heating system or open circuit of the flow sensor in Navien Ace and Navien Ace Coaxial only

1. Open the make-up tap and refill the AHU system with water to a pressure of 1.2-1.5 bar. Control is carried out visually by manometer.
2. Air in the HVAC system. Bleed the air from the heating system. Start the boiler in test mode for 1-2 hours, for this purpose set the first switch on the DIP-switch to "On" position and restart the boiler.
3. Open all shut-off and distribution valves in the DHW system, preventing normal water circulation.
4. Circulation pump does not reach rated speed. Check the value of the supply voltage in the mains. It should be equal to ~220 V. If the supply voltage is high or low, it is recommended to connect the boiler to the mains via an autotransformer voltage stabilizer. Check the resistance of the stator winding of the pump electric motor for open circuit or short circuit *. If the problem is detected, replace the pump.
5. The circulation pump operates normally, but the pressure is insufficient. Check the pump impeller for mechanical damage. If a fault is detected, replace the pump.
6. Power is supplied to the circulation pump, but it does not rotate. Check the electrical part of the pump. Check pump for jamming. Unscrew the plug on the end of the pump housing and use a slotted screwdriver to turn the rotor shaft of the pump motor several times. If a fault is detected, replace the pump.
7. Circulation pump is not energized. Control board malfunction. Restart the boiler, replace the control board in case of repeated failure
8. Check "Flow sensor – Control unit" circuit for open circuit. If a malfunction is detected, replace the flow sensor. In the flow sensor it is possible that the movable actuator with magnet (flag) hangs up. Disassemble and clean the flow sensor. It can be enough to hit the flow sensor a few times not too hard. The filter(s) of the HVAC system is dirty. Clean the filter(s), and restart the boiler.
9. Antifreeze is used as the heat transfer medium. In Navien boilers, the use of antifreeze is prohibited.

Malfunctions of the Navien gas boiler

We have put together this manual to help you repair Navien gas boilers on your own. It will be a huge assistance in getting rid of malfunctions and breakdowns. In order to find out what the self-diagnostic system can tell us, let’s list the Navien boiler’s error codes:

Despite the vast array of potential malfunctions, the majority of them are easily fixed with modest tools and do not pose a significant threat.

• 01E – overheating has occurred in the equipment, as evidenced by the temperature sensor;
• 02E – in Navien boilers error 02 indicates a break in the circuit of the flow sensor and a decrease in the level of coolant in the circuit;
• Error 03 in Navien boilers indicates that there is no flame occurrence signal. And the flame can burn;
• 04E – this code is the opposite of the previous one, as it indicates the presence of flame in its absence, as well as a short circuit in the flame sensor circuit;
• 05E – the error occurs at the failure of the circuit measuring the temperature of the coolant in the heating circuit;
• 06E – another breakdown code for the temperature sensor, indicating a short in its circuit;
• 07E – this error occurs when the circuit of the temperature sensor in the DHW circuit is faulty;
• 08E – error of the same sensor, but diagnosing a short circuit in its circuit;
• 09E – error 09 in Navien boilers indicates improper functioning of the fan;
• 10E – error 10 indicates a problem with the smoke exhaust;
• 12E – the flame in the burner has gone out;
• 13E – error 13 indicates a short circuit in the heating circuit flow sensor;
• 14E – code of no gas supply from the mains;
• 15E – a rather ambiguous error, indicating problems with the control board, but without a specific indication of the faulty unit;
• 16E – error 16 in Navien boilers occurs when the equipment overheats;
• 18E – malfunction in the smoke exhaust system sensor (sensor overheating);
• 27E – the electronics has registered errors in the air pressure sensor (APS).

Since a service company should perform the repairs, there is no repair manual included with the boilers. However, nothing stops us from fixing the malfunctioning unit on our own without calling in experts. Let’s look at some at-home Navien boiler repairs.

Navien boiler does not reach the set temperature

Installing a tap water softening and purification system will help prevent limescale; although it won’t be the cheapest, it will prolong the life of your boiler.

First things first, the Navien gas boiler’s heat exchanger needs to be cleaned. Citric acid, toilet bowl cleaners, or other special tools (if available) are used for this at home. After removing the heat exchanger and filling it with the chosen composition, give it a thorough rinse with high water pressure.

If the Navien boiler is not heating hot water, clean the DHW circuit’s heat exchanger in the same manner. The exchanger has to be replaced entirely in the most neglected cases.

Navien boiler quickly gains temperature and cools down quickly

An extremely complicated error signaling potential issues or flaws with the heating system. Make sure there is no air in the system and try to correct the situation by varying the circulation pump’s revolutions. Additionally, the heat exchanger’s filter and lumen need to be checked. It might be essential to replace the coolant in specific circumstances.

How to eliminate error 03 in Navien boilers

The electronics don’t get a flame signal for some reason. This could be the result of a broken flame sensor and its circuitry or a lack of gas supply. Occasionally, the error shows up following any gas main maintenance. An additional potential reason could be a malfunctioning ignition. Removal of the mistake:

• Check the gas supply;
• Check the operability of ignition;
• Check the ionization sensor (it could be dirty).

It is advised that the reducer be checked for proper operation before using liquefied gas.

Error 03 might arise if there isn’t a problem with the Navien gas boiler and there are any grounding issues.

Ways of troubleshooting

It is critical to fix issues as soon as possible, even in the event that the Navien boiler error 03 occurs. This code occasionally has nothing to do with a significant issue

Options for handling a Navien boiler’s error 03 include:

• Clean the flame sensor.
• remove the plaque formed on the electrode with a fine-grained emery cloth.

If the Navien boiler displays error code 09, the fan is the only component that is malfunctioning. In this scenario, getting the system back to normal operation will take a lot longer. Prior to removing error 09, you ought to:

1. Check the voltage in the area where the black and red wires of the fan are connected. It should be 100-200 V.
2. If the power supply is normal and the fan functions, but its speed is insufficient, it is necessary to replace the part.
3. If in the first 3 seconds before ignition the fan is rotating at a speed less than 400 rpm, the boiler should be replaced./min., the equipment will not work. At this rate, the code 09 is displayed on the screen for 12 seconds. If the problem is solved, the electrician rechecks the fan operation and the error message disappears after 30 sec.
4. If the fan is turned off and the display shows a speed of 2000 rpm, the fan may not be running./min., It is likely that a short circuit has occurred. It is necessary to replace the fan.

Comparable error code 10. If it happens, make sure the fan and contacts are in good working order and replace the affected part if needed. It might also be necessary to clean the chimney.

It might be necessary to replace the sensor if the code 13 appears. However, after cleaning the heat exchanger, the operating noise might go away. The coolant temperature should be lowered and as many taps as possible opened.

Moreover, Navien error 27 occurs frequently. It has to do with the APS sensor shorting out. It is important to consider the following when this error code appears:

1. The APS sensor itself may not be functioning or the sensor connector may be loose from the control board.
2. It is necessary to measure the voltage on the board at the pressure sensor connection. The error is shown on the display if the voltage is less than 0.06 V or higher than 4.8. In this situation, the sensor should be replaced.

Another crucial consideration when fixing gas equipment is that coolant needs to be replaced if it was drained in order to fix the malfunction. The gas must be turned off and the room de-energized before refueling. Distribution and shut-off valve positions must be verified, and they must be opened to the greatest extent feasible.

Turn the make-up valve to the left; it’s usually found at the bottom of the apparatus. The tap closes when the pressure gauge reaches the 1,2-2 bar mark. You must empty the liquid and start the process over if the alarm indicator activates after pouring.

Characteristics of Navien boilers

Manufacturers of Navien gas heating systems offer extended warranties for their products. The boilers are known for their excellent construction and uncommon breakdowns. However, even in the event of difficulties, they can be resolved fast.

Technical features

One of South Korea’s top manufacturers is Navien. Over 30 countries worldwide have high demand for produced equipment. Both single- and double-circuit boilers are included in the model range, and they include:

• If you are operating on liquefied gas;
• turbocharged;
• condensing.

There are floor-and wall-mounted pieces of equipment. Installing the latter is a great idea for country homes. The room is heated and the hot water is supplied by this system. Moreover, floor standing The device’s ease of use and compact design define it.

The Ace, Deluxe, and Prime models are generally highly well-liked in Russia. These types of systems are best suited to pressure drops and erratic power grid operation.

The company started manufacturing contemporary electric heating boilers not too long ago.

Advantages of the systems

This brand’s gas boilers are distinguished not only by their excellent assembly quality but also by their reasonable price. Furthermore, it is noteworthy to highlight the subsequent benefits of the systems:

1. A special microprocessor is installed on the control unit to protect the equipment from voltage surges.
2. The operating mode is automatically maintained and there are many settings available.
3. Long service life.
4. Can be operated with liquefied and natural gas.
5. The boiler continues to work at a drop in pressure up to 0.1 bar.
6. In case of problems with gas, the equipment does not freeze up. When the temperature drops to +5°C, the burner automatically starts working. If ignition is impossible, a circulating pump functions. These measures reliably protect the system from freezing.
7. Adjustment is simple and straightforward.

Causes of malfunctions and their elimination

Knowing the causes of malfunctions is essential to knowing how to fix this or that issue with the gas unit:

1. Code 01E indicates an increase in temperature in the appliance. This may be due to a blockage in the ducts, which has caused them to narrow, or there are problems with the flow sensor .
2. Code 02E indicates the presence of air, insufficient water, damaged impeller in the circulation pump, closed distribution valve, or the flow sensor is inoperative.
3. Code 03E is displayed as a result of problems with the ionization sensor, lack of gas supply, ignition, when the tap is closed, when the boiler is not properly earthed.
4. Code 05E indicates a bad contact between the temperature sensor and the controller or a short circuit in the same area.
5. Code 10E is displayed on the screen if the fan has failed or if the sensor tubes are not connected directly to the fan correctly. In addition, a clogged chimney or a strong gust of wind can also cause the appliance to malfunction.
6. Code 11E, usually displayed on European boilers (with corresponding sensors).
7. Code 13E indicates a short circuit in the heating water flow meter.
8. Noise occurrence and rumbling noise possible with bad heating medium.
9. The cause of no hot water is a valve, which has become defective. Optimum valve life is 4 years.

How to correct:

1. Error 01E: thoroughly inspect the impeller in the circulation pump to detect various faults; check the resistance in the pump coil itself; examine the heating system for air (drain excessive air).
2. Error 02E: bleed the air; check the pressure, check the resistance in the coil; check if there is a short circuit; open the valve (distribution valve); check the resistance in the flow meter; remove the sensor housing and clean the flag.
3. Error 03E: Clean debris from the flame sensor (you can use fine-grained sandpaper to get rid of gray scale on the electrode).
4. Error 05E: investigate the circuit from the controller to the sensor. If there are malfunctions, the sensor should be replaced with a new one. The connectors of the meter and controller must be disconnected first and then connected.
5. Error 10E: Repair or replace fan; check connections on meter tubes; clean all debris from the chimney.
6. Error 13E: replace the sensor.

By taking the product apart and cleaning the heat exchanger, you can eliminate the hum and noise. It is necessary to replace the part if the issue continues. Examine the taps; they ought to be as open as possible. Lower the water’s temperature.

We examine common problems that may occur with Navien gas boilers in our article "Gas Boiler Navien: Faults and Their Fixing," along with workable solutions. Our straightforward instructions can assist homeowners in promptly identifying and resolving issues with their Navien boilers, ranging from debugging error codes to handling typical malfunctions like water leaks or ignition failure. This article aims to empower readers to maintain their heating systems effectively and ensure warmth and comfort in their homes all year long with clear explanations and step-by-step instructions.

Types of boilers NAVIEN and their features

High-efficiency condensing gas boiler: NAVIEN NCN. Recovering heat from the exhaust gases results in more effective fuel use. Consequently, the smoke cools down to the point where it can be released through plastic pipes, greatly streamlining the chimney equipment process.

Additional features of the appliance:

• Boiler output – 19-37 kW;
• protection against freezing;
• programmable modes;
• operation on mains or liquefied gas;
• quiet operation;
• Electricity is required;
• no room air is used for combustion;
• approximate prices – 40-50 thousand rubles.

SteelGA/GST is a gorgeous, compact floor-standing gas boiler that heats and hot-waters the space. Contemporary burner engineered to use the least amount of gas.

• power 11-35 kW;
• heat exchanger material – high-carbon stainless steel;
• SMPS chip for protection against power surges;
• protection against freezing;
• lateral positioning of spigots (easy to install, can be placed close to the wall).

Ace Atmo and NAVIENAceTurbo are wall-mounted gas boilers. An air pressure sensor (APS) is a feature of the Ace TURBO series. The turbocharger fan, which is positioned beneath the combustion chamber, has its speed controlled by the sensor. This system helps to minimize heat loss and supply the ideal air volume.

Ace Atmosphere Navien

Boiler with open burner: Ace Atmo. While it shares many of the AceTurbo’s features and benefits, it is thought to be better suited to the harsh winters in Russia. Connecting this appliance is simpler.

• protection against freezing;
• protection against voltage drop and unstable gas supply;
• heat exchanger made of stainless steel;
• heats tap water even with low pressure;
• prices – 19 – 27 thousand rubles.

Wall-mounted liquid fuel boilers are called NAVIEN LST. Diesel fuel can be used with any brand. The filter offers impurity protection.

The LST-KR model, in which the fuel is preheated (cooled by an air pressure sensor), is appropriate for colder climates. gasoline thickens and becomes viscous. This makes summertime, less expensive diesel available all year long. gasoline.

• lightweight, compact;
• 90% EFFICIENCY;
• protection against voltage fluctuations;
• two circuits – heats the water;
• the kit includes a set of replacement cartridges for the filter;
• work with low-pressure water;
• spigots on the sides;
• does not make noise;
• prices – 25-75 thousand rubles.

The Navien boiler’s appropriate output can always be selected by the user. Power options available: 11, 13, 16, 19, 20, 24, 30, 35, 37, and 40 kW.

Based on sales volume, the Ace series boilers are the most widely used boilers in the Russian market.

Varieties and advantages of gas boilers Navien

The product line of Navien is divided into multiple series, with the main distinction being the installation method:

• Floor-mounted. This type is mostly used for installation in private homes, as it requires a separate room. The power of units produced by the two series varies from 11 to 60 kW.
• Wall-mounted. These are used everywhere due to their compactness, simple design and unpretentiousness. These boilers are presented in five series by versions with a capacity from 10 to 40 kW.

Boilers made by Navien have similar designs. Except for the ATMO series, they have a closed combustion chamber and are double-circuit. In terms of control, the only difference is in the electronics equipment.

The following are the equipment’s benefits:

• Room temperature sensor and remote control, including on some models with a smartphone.
• Protection against voltage surges by installing an innovative SMPS chip.
• Built-in frost protection system.
• Use of stainless steel heat exchangers.

One drawback of gas heaters, such as the Navien boiler, is that they require a constant source of power. It is advised by the manufacturer to install UPS.

The gas boiler’s internal component

Malfunctions of gas boilers Navien and their elimination

As you are aware, nothing is everlasting or completely dependable; all machinery eventually breaks down. While researching the solution to the Navien boiler’s error 03, keep in mind that there could be more failures.

Occasionally, these are small flaws that the owner himself can identify and even fix. Code "01" gathers a number of likely causes of failure during regular operation, including blockages in the heating circuit, malfunctions with the circulation pump, or deterioration of the regular flow through the pipes. Try clearing the heating line filter of any extra air to see if that solves the issue. Subsequently, visual inspection and motor winding resistance measurement should be used to check the pump (impeller and motor).

Externally, everything appears to be operating when the code is "02": the hot water circuit, which flows from the faucet, is operating, but it abruptly turns cold. The following problems should be looked for: a faulty distribution valve, a weak water level, and sensor failure. The circulation pump might malfunction.

Vent the air, examine the motor and circulation system, and verify the shut-off valve positions in order to resolve the error. Examining the sensor won’t harm you, but a clogged system is typically the cause of the gas boiler’s two-circuit wall-mounted Navien malfunction.

Erroneous connections or damage to the fan’s air supply tubes are the main causes of the "10" error code. Sharp wind gusts can result from the same mistake, which can also clog a chimney. In any case, you should begin by inspecting the main combustion product exhaust line.

A malfunction in the automated temperature measuring system is indicated by the code "05". Examine the state of the wires that link the controller board and the sensor. Occasionally, cleaning the contacts or disconnecting and reconnecting the sensor suffices without needing to replace it.

Aside from the issues listed above, the boiler will occasionally buzz when the hot water tap is opened. Experts describe this issue as common and pervasive and attribute it to a clogged heat exchanger. Although replacing the unit is the best course of action, you could attempt cleaning it first.

The Navien boiler’s insufficient ability to heat hot water results from a failed three-way valve, which rarely lasts longer than four years (with normal operation of other systems, including the heating circuit). The solution is to install a fresh one.

Tips for operation

Naturally, owners of any heating equipment are very interested in learning how to prolong the equipment’s useful life, avoid common issues, and put off necessary repairs. But looking out for your personal safety is even more crucial. Opening the device and tampering with the casing’s sealing is strictly forbidden, especially when it’s in use. The boiler is filled with numerous hot, sharp, and energized parts. If the boiler needed to be disassembled, only trained professionals should undertake both this task and the installation of a new boiler.

Make sure the boiler supply cable is not crushed or bent during installation or use, and that it stays away from hot surfaces and objects that could cut it. It is not permitted to place hot or heavy objects on the boiler or to subject it to vibration. Additionally, it is not worth using as a ladder or stand. You must stand on a stable surface if cleaning the device or any of its parts is required. Kitchen tables, stools, and stepladders cannot all be categorized as such surfaces.

Use only mild cleaning solutions when cleaning any area of the boiler. Solvents should not be used for this purpose. Additionally, avoid gathering easily ignitable materials, especially liquids, close to the heating installation or even leaving for a brief period of time. When you smell carbon monoxide, see smoke and burning, or notice soot emissions, you should turn off the system regardless of the weather, unplug the gas and electrical supplies, open the windows, and contact experts. At least one of these rules must be followed in order to prevent harm, fire, and death.

Gas boilers should not be installed in highly humid areas, especially when it’s still hot outside. Even heavy-duty metal can be easily destroyed in such conditions, and pipes and other components are more likely to build up scale. It is best to avoid doing any maintenance or construction near the heater, as well as any other activity that releases dust. This can lead to the system’s irreversible failure in addition to decreasing its efficiency. And the repercussions will still be severe even if "only" the central board breaks.

Multiple flushings are required to control the heating circuit; it is crucial to reduce the amount of water that comes into contact with air. During combustion, even a fuel as pure as natural gas leaves behind a variety of deposits.

As a result, the burner, chimney, and ventilation system should all be cleaned on a regular basis. Technical inspections are required every six to twelve months, even in cases where there is no reason for concern.

Just so you know, you should always have someone nearby to help if things get out of hand when doing do-it-yourself repairs and maintenance.

The maintenance of a Navien wall-mounted gas boiler is demonstrated in this video.

Error 09

These are the most prevalent error codes. They indicate that the fan has stopped or is operating at a lower efficiency. Testing the resistance and verifying the integrity of its windings is done in order to precisely identify the cause. Verifying that there isn’t an interturn short circuit is also essential. It is preferable to replace the device if the malfunctions are severe. The control board needs to be tested if the fan is operating without any issues. It is best to seek assistance from a service center if you lack the necessary skills for this procedure.

Navien faults

Although a gas boiler is a straightforward appliance, all of these units have safety automatics installed to guarantee safe operation and help avert catastrophic mishaps in the event of a malfunction. Nearly every physical action that takes place while the unit is operating is managed by a variety of sensors, the data from which is continuously processed by the control unit.

Information is given to the user on the control panel display in the form of codes for simple diagnostics and troubleshooting. These codes can be used to identify which specific system has the fault and what checks can be made to fix it. We will then go into further detail about the most typical mistakes made by Navien boilers.

Common Faults	Elimination
No Heat or Hot Water	Check gas supply, reset boiler, inspect thermostat settings
Strange Noises	Flush system, check for air in pipes, inspect pump and valves
Leaks	Tighten connections, replace faulty parts, inspect for corrosion

For homeowners, fixing issues with a gas boiler, particularly one as complex as the Navien, can be quite difficult. In the long run, though, time and money can be saved by being aware of common problems and their solutions.

Error codes are one of the most common issues with Navien gas boilers. These codes function as markers for underlying problems, which can range from small bugs to more significant malfunctions. Through familiarizing themselves with these codes and consulting the user manual, homeowners are frequently able to identify the issue and resolve it.

A Navien gas boiler’s potential for many problems can be avoided with routine maintenance. Simple maintenance procedures like filter cleaning, leak detection, and making sure the unit has enough airflow can greatly lower the chance of malfunctions and increase the unit’s lifespan.

When a Navien gas boiler breaks down, homeowners need to be cautious and put safety first. If the problem is more complex than they can handle, it is best to get professional assistance. Without the required abilities and knowledge, attempting complicated repairs could make the issue worse and possibly jeopardize one’s safety.

Finally, it should be noted that although Navien gas boiler problems can be annoying, they are not insurmountable. Homeowners can effectively address issues as they arise and ensure dependable heating and peace of mind throughout the winter months with the right knowledge, upkeep, and prompt intervention.

Video on the topic

Repair and maintenance of Navien (Navien) Ace boiler.

NAVIEN BOILER ERROR 10.CAUSES AND REMEDIES.

MALFUNCTIONS AND FAULTS ON MY NAVIEN BOILER OVER 6 YEARS OF OPERATION