9 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 has lost all power and is completely unresponsive, meaning it is not receiving electricity to operate.
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.
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 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.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes