Error 108. Ariston gas boiler. What is the cause and how to eliminate it

Imagine yourself curled up at home in the dead of winter, depending on your Ariston gas boiler to keep you warm. Error 108 appears on your boiler’s display and starts flashing out of nowhere. Fear descends. What does that signify? How can it be fixed? We’ve got you covered, so don’t worry.

Your Ariston gas boiler’s error number 108 may seem like a difficult problem, but don’t worry—with a little troubleshooting, you can fix it. The first step to getting your heating system operating again is figuring out what’s causing it.

What specifically triggers Error 108 on your Ariston gas boiler, then? A frequent offender is low water pressure. Error 108 may appear when the water pressure in your boiler is too low, which is necessary for it to operate properly. Problems with the gas supply or ignition are additional possible causes.

The important question now is: how can you resolve Error 108 on your gas boiler Ariston? Thankfully, before bringing in the experts, there are a few actions you can take to troubleshoot and possibly fix the problem yourself. To start with, make sure the water pressure gauge on your boiler is within the recommended range. You’ll need to repressurize the system if it’s too low.

When repressurizing the boiler doesn’t resolve the issue, further investigation is warranted. Examine the ignition system of the boiler for any indications of wear and tear or malfunction. Error 108 can sometimes be resolved with a straightforward ignition system reset. Make sure the gas valve on your boiler is open and that your gas supply is continuous.

When troubleshooting your Ariston gas boiler for Error 108, safety must always come first. Please don’t hesitate to seek help from a qualified heating engineer if you have any questions about the procedure or if you are unable to fix the problem on your own. Recall that having a warm and comfortable home is worthwhile!

First steps

The heating system’s malfunctioning pressure is indicated by error code 108. Low water pressure in the device’s heating circuit is indicated by the Ariston boiler’s "Err 108" error code. As a result, you will need to replace the water pressure switch and use the make-up tap to reenergize the boiler.

Verify the pressure gauge’s readings, which are found next to the display, before starting the direct repair. It will be necessary to start the repair by replacing the sensor if the pressure is equal to 1.5 bar. To that end, the following preparatory steps ought to be taken:

• Turn off the Ariston boiler using the button on the control panel;
• Disconnect the appliance from the mains power supply;
• Shut off the gas supply with a tap.

Following that, the boiler’s fasteners should be removed, and disassembly should begin.

In dealing with Error 108 on your Ariston gas boiler, understanding the cause and how to fix it is crucial. Error 108 typically indicates a problem with the ignition or flame detection system. This could be due to issues with the ignition electrodes, gas supply, or flame sensor. To troubleshoot, start by checking for any obstructions in the gas supply or around the burner. Clean the ignition electrodes and ensure they are properly positioned. Additionally, clean the flame sensor to ensure it can detect the flame accurately. If these steps don"t resolve the issue, it"s best to consult a professional technician to diagnose and fix the problem safely. Prompt action can prevent further complications and ensure your boiler operates efficiently.

Disassembling the Ariston boiler drum

Removing the front panel

The Ariston boiler’s front decorative cover must be removed in order to proceed. The lower fasteners must be removed using a screwdriver with a star-shaped tip. Once the self-tapping screws are removed, pull the front panel’s bottom in your direction, raise it, and take it out of the boiler. The control panel needs to be lowered as well. After that, you can move on to the next step, which is taking off the furnace’s front cover.

Removing the front firebox cover

The Ariston boiler furnace’s front cover has two locks at the bottom. Unbolting them is the first step in disassembling this section. Subsequently, the furnace’s front cover can be removed by following the same procedure as removing the front panel: it needs to be lifted from the boiler’s bottom and removed.

Removing the right side panel

It is advisable to additionally disassemble the right side side decorative panel for the ease of future repair work. First, two on the front side and two on the bottom side of the self-tapping screws need to be undone. Please be aware that a Phillips screwdriver is required to remove the fasteners from the front, and a star-shaped nozzle is required to remove them from the bottom. It should be fairly simple to remove the right side panel after these adjustments. After that, you can begin interacting with the coolant system’s internal component.

Drainage of water from the boiler system

Upon closer inspection of the Ariston boiler’s internal components, it can be seen that the low pressure sensor is fixed to the circulation pump’s volute. As a result, the boiler system must have its water drained before any repairs are made. The following is how this process is executed:

• The heating system taps are blocked;
• For the convenience of the procedure, a silicone socket is connected;
• Open the drain cock built into the boiler;
• The water is drained from the system, resulting in a drop in pressure;

Once the boiler is completely dry, disconnect the silicone sleeve if it was in use during the drainage process and close the drain cock. After that, you can fix the malfunctioning water pressure switch to directly eliminate the 108 error.

Repair of the Ariston boiler pressure sensor

Removing the water pressure switch

The pressure sensor is connected to two orange wires. The solution will be similar for your boiler. The boiler supply circuit is another place where the sensor may be found.

Disassembling the faulty sensor is the first step in the repair process. It doesn’t take much work to remove the water pressure switch in the Ariston boiler, and the procedure is as follows:

• It is necessary to remove the connector from the sensor;
• Move aside the fixing bracket located at the bottom;
• Lift the sensor and remove it from the boiler.

The broken water pressure switch must be disassembled in order to buy a new replacement part and install it. It can be purchased online as well as at regular construction supply stores. Such a part for Ariston boiler repair typically costs between 1500 and 2500 Russian rubles.

Installation and connection of a new water pressure switch

The new sensor is easily installed; that is, in accordance with the plan, the opposite of its disassembly:

• It is necessary to return the water pressure switch to its original position;
• Secure its position with the lower bracket;
• Connect the previously removed connector to the sensor.

Following these adjustments, you can reassemble the Ariston boiler. The right side panel that was previously disassembled should be put back together and fastened with self-tapping screws to begin this process. Please remember that you need to have both star-shaped and Phillips screwdriver bits. Subsequently, the boiler control panel is raised and positioned. Following boiler reassembly, the following steps are taken to make it up:

• The heating and make-up taps are opened;
• Make-up is carried out until the pressure gauge indicator is equal to 1.5 bar;
• The make-up valve is closed after the end of the circulation;
• The boiler is reconnected to the power supply system again.

Checking the operation of the boiler and the new part

Checking for proper operation of the new water pressure switch and the boiler is the final step in resolving the Ariston gas boiler error 108. The heating medium will initiate the electronic board’s self-diagnosis upon startup. After this is finished, the display will read "Off" and the Ariston boiler will enter standby mode. The heating medium must then be switched to winter mode by pressing the left switch on button. By doing this, the pump will be turned on and the device’s circulation system will begin. The integrated automatic air valve will release any air that is still in the boiler from the coolant cavity.

Please be aware that the boiler will enter lockout mode at this point because the gas supply is still disconnected. However, the process of depleting the air that remains will go on.

Restart the boiler, reestablish the gas supply, and reconnect the heating mode as soon as any noises in the coolant cavity cease. The pump and fan will turn on as a result. The flame icon on the control panel display will indicate that ignition has begun inside the boiler as a result. This indicates that the 108th error was successfully fixed, and the heating medium is now fully functional and operational.

You’re not the only one who has experienced Error 108 with your Ariston gas boiler. Your heating system may be disrupted by this frequent problem, particularly in the winter months when you most need it. But worry not—you can avoid cold discomfort by knowing the cause and how to address it.

One of the most common causes of Error 108 is frequently an ignition issue. Numerous things, like a malfunctioning igniter, problems with the gas supply, or even a build-up of debris in the ignition system, could be the cause of this. Error 108 is raised when the boiler doesn’t ignite correctly, signaling that there is a problem with the ignition process.

There are a few troubleshooting steps you can take to fix Error 108 and get your boiler working again. First, make sure there are no leaks or disruptions in the gas supply by inspecting it. Next, look for any obvious damage or obstructions in the ignition system. Resolving the problem can also involve cleaning the igniter and making sure it is properly aligned.

Should these simple troubleshooting steps fail to fix Error 108, it might be necessary to bring in an expert. A competent technician can examine your boiler more thoroughly and identify any underlying problems that might be the source of the error. Their skills can quickly restore your heating, whether it’s by swapping out a malfunctioning part or resetting the ignition system.

Regular maintenance is essential when it comes to Error 108 because prevention is always preferable to treatment. Plan regular boiler inspections to identify any possible issues before they become serious. Error 108 is less likely to occur in the future if the ignition system is kept clean and maintained, which will guarantee that your house stays warm and comfortable when you need it most.

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