11 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Baxi 600 or 800 Series
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 →
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Your boiler has reached the correct temperature and is simply taking a break until it needs to heat up again.
Your boiler is experiencing a temporary temperature reading issue and is currently trying to fix itself automatically.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler has briefly lost its flame and is attempting to restart itself automatically.
Your boiler has tried to light itself several times but cannot create a flame, meaning you will not have any heating or hot water until it is reset or repaired.
Your boiler is temporarily struggling to talk to its internal control parts and is trying to reconnect itself.
Your boiler has detected an issue with the ventilation fan, which means it cannot safely clear exhaust fumes and will not ignite.
Your boiler has experienced a temporary electronic communication glitch and is attempting to sort itself out automatically.
Your boiler's internal memory chip has developed a software or connection error, meaning it can no longer remember its correct settings to operate.
Your boiler is experiencing a communication error or internal electronic fault that is preventing it from running properly.
Your boiler has detected a general internal error, often linked to a small electronic glitch or a sensor that is failing to communicate correctly with the main controls.
BoilerFaultCodes