Ariston Heater error A3

What is the fault of the A3 Ariston error affecting your heater?

You may encounter this type of failure in Ariston brand heaters at some point. If you have one of these heaters, then you are in the right place to understand the reason for this fault and how you might fix it.

The A3 error code in Ariston heaters indicates that there might be a problem with the flue pressure switch. This device is a safety component in your heater, used to prevent excessive evacuation of smoke and combustion gases.

If the pressure switch detects an abnormal pressure difference inside, it will lock out for safety reasons, rendering the heater unusable for a few moments until both the temperature and the exit of combustion gases can be regulated.

It is extremely important to check and fix this type of error as soon as possible. Your heater is warning you that there might be a risk of poisoning in your home or even a fire. To prevent a catastrophic situation, this is why the heater displays the error and locks out.

Among the possible causes that can trigger this error code in your heater, we have the following:

• The flue pressure switch is either poorly connected or outright damaged and needs to be replaced with a new one.
• The pipe or duct that expels the smoke outside is lacking maintenance. It may be blocked by dust, dirt, insects, or small animals like mice or birds.
• The pipe or duct that expels the smoke outside has leaks or its sealing has deteriorated since the time of installation.
• The heater's extraction fan is not working correctly. It might be very dirty with dust stuck in the rotor of the propeller, or it may be outright damaged and needs a replacement.

How to fix the A3 error of the Ariston heater?

To effectively resolve the A3 error code on the Ariston heater, you can try the following tips we've listed below:

1. Restart the heater: Turn it off and disconnect it from the power source for a few minutes. Wait for the device to cool down completely, then reconnect and turn it on to see if the error has disappeared. As simple as this step sounds, it can cause the sensors to reset and recalibrate.
2. Check the connections of the flue pressure switch: Ensure the connections are in good condition with no leaks or breaks of any kind. You can also check the electronic connections of the pressure switch, such as the wiring, terminals, and sensors. Using some electronic cleaner, you can clean these connections and make them almost like new.
3. Clean the smoke duct and check it for leaks or obstructions: Ensure that this duct is free from anything that might be blocking it. Sometimes pigeons can nest and mice can seek refuge in there. If it's very dirty, you will need to do some maintenance to clear it as much as possible.
4. Verify the proper operation of the heater's extraction fan: Ensure that this fan is spinning at a good speed and is functioning under optimal conditions. If this fan is faulty, it will not be able to evacuate all the smoke or combustion gases associated with your heater. You might need to do some preventive maintenance or replace it with a new one.
5. Review all the advice we've given you: Please make sure you've followed all the steps precisely. Take note of each one and double-check that you haven't missed any of these checks.
6. Turn to Ariston technical support: If the problem persists after you've conducted all these checks and potential solutions, then it might be time to leave it to the experts. Call Ariston's technical service; they will help you resolve this issue quickly, effectively, and safely.

In summary, to conclude this brief guide, the A3 error code on your Ariston heater is related to a fault in the flue pressure switch. We recommend addressing this situation with the urgency it deserves. While it's true that your heater's safety system has triggered to prevent further damage, we cannot leave anything to chance.

To fix this fault, you should:

• First, try restarting your heater
• Check the connections of the flue pressure switch
• Clean the smoke duct and inspect it for leaks or obstructions
• Ensure the heater's fan is working correctly
• Review all the advice we've provided
• Seek help from Ariston technical support