7 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Tap any card for details
Your boiler has automatically shut down because the water inside it has become dangerously hot.
Your boiler's heating temperature sensor has failed, which means the system cannot accurately measure how hot the water is getting.
Your boiler is struggling to accurately measure the temperature of your hot water because a sensor is faulty.
Your boiler's main electronic brain is failing to control the ignition and operation properly, which usually results in a complete shutdown to keep your home safe.
Your boiler has detected an issue with the sensor that measures the temperature of the exhaust gases leaving the flue.
Your boiler is trying to start up, but it cannot sense the flame once the gas ignites, so it safely shuts itself down to prevent any gas build-up.
Your boiler has safely shut down because a sensor has detected that the exhaust gases leaving through the flue are too hot.
Monthly cover means no unexpected bills when your boiler breaks down.
Affiliate links. We may earn a commission at no extra cost to you.
BoilerFaultCodes