8 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: EcoBlue
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 detected a problem with one of its temperature sensors and has stopped working as a safety precaution.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler is struggling to move water through the system, which is usually caused by trapped air or a blockage in the pipes.
Your boiler's electronic control centre has developed an internal fault and is unable to communicate with the rest of the system.
Your boiler is struggling to light and stay on, which can sometimes be caused by trapped air in your heating system preventing the water from flowing correctly.
Your boiler has lost water pressure or cannot move water around the system, which has caused it to stop working for safety.
The main computer inside your boiler has encountered a technical failure and is unable to control the heating process.
Your boiler has sensed a dangerous level of overheating within its internal system and has locked itself down as a safety precaution.
BoilerFaultCodes