3 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
Tap any card for details
Your boiler's internal thermometer is failing to send reliable signals, so the system has shut down to prevent it from overheating.
Your boiler has detected that it is getting too hot and has automatically shut down to prevent any damage or safety hazards.
Your boiler is operating exactly as it should be, and the 'B' light simply confirms that the burner is currently lit and heating your water.
BoilerFaultCodes