19 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Ideal Mexico HE
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Your boiler has detected a general internal fault that prevents it from operating, and because these codes cover a wide variety of issues, a qualified engineer must investigate.
Your boiler has detected a critical internal error that has caused it to shut down to prevent damage, and it will not function until a professional identifies the cause.
Your boiler is failing to detect that it has enough airflow to safely burn gas, so it has shut down to prevent any risk.
Your boiler has stopped working because it is unable to accurately measure its own internal temperature to ensure it is heating safely.
Your boiler's temperature sensor is providing incorrect readings, so the heating system has stopped working to prevent potential overheating.
Your boiler has failed to light the flame after several attempts and has shut itself down for safety.
Your boiler has tried to start five times but failed to ignite, so it has safely shut itself down to prevent a build-up of unburnt gas.
Your boiler has stopped working because it cannot light the internal flame or detect that it is burning correctly.
Your boiler has stopped working because it cannot properly clear exhaust gases, which is a key safety feature for operation.
Your boiler has detected an issue with a built-in safety sensor that monitors water levels, which is currently preventing the system from operating correctly.
Your boiler has detected an issue with the internal component that controls the flow of gas, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has failed to start after several automated attempts and has safely shut itself down to prevent a gas build-up.
Your boiler has failed to start up after multiple attempts and has automatically turned itself off for safety.
Your boiler has stopped working because it cannot detect that water is moving through the system as it should.
Your boiler is struggling because it cannot detect the current outside temperature, so it may not adjust your heating levels correctly.
Your boiler has detected that it is getting too hot and has automatically shut down to prevent damage or potential danger.
Your boiler has switched itself off because it has detected an unsafe rise in internal temperature and needs a professional to check it is venting heat correctly.
Your boiler's water circulation pump has stopped working, which means the system cannot move hot water to your radiators or taps.
Your boiler is struggling to circulate water around your radiators and taps because the internal pump is not working correctly.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes