19 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Potterton Puma 80/100 (next gen) / Potterton Promax range
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 is attempting to light but failing to stay on, which means it cannot provide hot water or heating.
Your boiler has failed to light the flame after three attempts and has safely shut down to prevent gas from building up.
Your boiler has lost all power and is completely unresponsive, meaning it is not receiving electricity to operate.
Your boiler has detected a temporary issue and stopped running to protect itself, often triggered by a power flicker or a blockage in the internal airflow system.
Your boiler has detected an issue with the electrical power supply, meaning it is not receiving electricity in the correct way to operate safely.
Your boiler is signalling that it detects a flame when it should not, which is a safety precautionary lock-out to prevent potential issues.
Your boiler is operating normally and is currently firing to provide heating or hot water for your home.
Your boiler has stopped working because it couldn't successfully light the flame after three attempts, often caused by a temporary interruption in the gas supply or air in the lines.
Your boiler has shut itself down as a safety precaution because it has detected an internal fault or an interrupted gas supply.
Your boiler has stopped working because it cannot light its burner or has detected an internal safety problem and shut itself down to prevent damage or risks.
Your boiler has stopped working for safety reasons because it either cannot light the flame or the system has become too hot.
Your boiler has lost the water pressure it needs to circulate heat, so it has safely shut itself down until the system is topped back up.
This light simply shows that your boiler is receiving electrical power and is switched on.
Your boiler has detected a lockout fault which means it has safely shut itself down and stopped providing heating or hot water.
Your boiler has switched off for safety because it got too hot, and it will stay off until it is manually reset.
Your boiler's small starter flame has gone out, which has caused the system to shut down for safety because it can no longer safely ignite the main burner.
Your boiler's small starter flame has gone out, meaning it cannot ignite the main burner to provide you with heating or hot water.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has stopped working for safety reasons and needs a manual restart because it either failed to spark or the water pressure is too low.
BoilerFaultCodes