19 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Promax System HE
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 →
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-590-88 | Performa System 12e | 2002–2006 |
| 41-590-89 | Performa System 18e | 2002–2006 |
| 41-590-90 | Performa System 24e | 2002–2006 |
| 41-590-91 | Performa System 28e | 2002–2005 |
| 41-591-24 | Performa System 12 HE | 2004–2011 |
| 41-591-25 | Performa System 18 HE | 2004–2011 |
| 41-591-26 | Performa System 24 HE | 2004–2011 |
| 41-591-27 | Performa System 28 HE | 2004–2011 |
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Your boiler has detected that it is running too hot or has experienced an internal control error, so it has safely shut itself down to prevent damage.
Your boiler has detected an internal electrical or mechanical fault that is preventing it from circulating water around your home.
Your boiler is struggling because the internal pump, which pushes water around your radiator system, is stuck or has stopped working correctly.
Your boiler is struggling to detect water moving through its system, which prevents it from firing safely.
Your boiler has detected an issue with the airflow system, which means it cannot safely clear waste gases and has therefore shut itself down to prevent a hazard.
Your boiler is failing to light the burner because it cannot detect or create the initial spark, so it has safely shut itself down to prevent a build-up of unburnt gas.
Your boiler is failing to stay lit because it cannot reliably detect the flame needed to heat your home.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has automatically turned itself off because it has become too hot to operate safely.
Your boiler has detected that the internal fan responsible for safely exhausting fumes is not rotating or working correctly, so it has shut down to keep your home safe.
Your boiler has switched itself off because it has reached a temperature that is too high, often caused by a circulation problem or a blockage.
Your boiler has stopped working because it failed to light properly or the waste water pipe is blocked.
Your boiler has shut down because its internal safety sensors detected that it was beginning to overheat.
Your boiler has stopped working because either there isn't enough water pressure in the system or the internal pump is unable to circulate water.
Your boiler has detected a problem with its internal temperature sensors, meaning it cannot accurately measure how hot the water is and has shut down as a safety precaution.
Your boiler has detected that a temperature sensor is not working correctly, which has caused the system to stop running to prevent overheating.
Your boiler has no electricity flowing to it, meaning it cannot operate or communicate with your heating controls.
Your boiler's internal water pressure has climbed too high, which means the system is under too much strain and needs to be brought back down to normal levels.
Your boiler has developed an internal electrical fault that is preventing it from restarting even after you try to reset it.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes