10 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 is struggling to clear exhaust gases effectively because the internal fan or air sensors are not working as they should, causing the system to stop for safety reasons.
The mechanical component that manages the fuel or air flow inside your boiler is stuck and cannot move to its required position, preventing the boiler from starting.
Your boiler has stopped working because one of its internal temperature sensors is not sending a clear signal, preventing it from safely heating your home.
Your boiler is struggling to clear exhaust gases or draw in fresh air, so it has safely shut down to prevent unsafe operation.
Your boiler has lost all power and is completely unresponsive, meaning it cannot provide any heating or hot water until the electrical connection or internal safety switch is restored.
Your boiler has automatically shut down to prevent damage because it has become too hot to operate safely.
Your boiler has stopped working because it has completely run out of wood pellets.
Your boiler has detected heat moving in the wrong direction through the pellet fuel system, which has triggered a safety shut-off to prevent fire risk.
Your boiler has lost the signal from one of its internal temperature sensors, which is preventing it from heating your home safely.
Your boiler has stopped working because the mechanical part responsible for feeding fuel into the fire is stuck, likely due to a build-up of ash residue.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes