26 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Promax Combi
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 |
|---|---|---|
| 47-393-06 | Performa 24 | 2001–2006 |
| 47-393-08 | Performa 28i | 2001–2006 |
Tap any card for details
Your boiler has detected an issue with the sensor that monitors the water temperature, causing the system to shut down as a safety precaution.
Your boiler is struggling to circulate water properly, which means it cannot produce hot water or heating until the internal pump is moving again.
Your boiler has detected a problem with the sensor that measures hot water temperature, which means your taps may not get warm.
Your boiler is failing to detect the flow of water needed to fire up the heating, meaning it cannot start the system.
Your boiler has stopped working because the water pressure inside the system has dropped too low.
Your boiler has detected a fault and stopped working, and it requires a manual reset to attempt to clear the error.
Your boiler has stopped working because it cannot safely vent waste gases or confirm that the fan is running correctly.
Your boiler is struggling to clear exhaust fumes safely, so it has purposefully turned itself off to prevent a hazard.
Your boiler has likely become too hot or water is not circulating correctly, causing it to shut down for safety.
Your boiler is failing to vent exhaust gases properly because it cannot confirm that the flue fan is working as it should, so it has shut down for safety.
Your boiler has tried to light but cannot detect a flame, which means it has locked itself out for safety.
Your boiler is trying to start but failing to stay lit, which means it cannot provide hot water or heating until the issue is resolved.
Your boiler has become too hot and has automatically shut down as a safety precaution.
Your boiler has detected an internal error and has temporarily stopped working to prevent damage, often caused by low system pressure or a temporary glitch.
Your boiler has detected an issue with how it clears exhaust gases, which has caused the system to shut down for safety.
Your boiler has detected an internal communication error or a disconnected jumper wire, which usually prevents the preheat function or the boiler from operating correctly.
Your boiler has tried to fire up but could not light the flame, causing it to shut down for safety.
Your boiler is likely struggling to provide hot water or maintain the correct temperature because its internal hot water thermometer has stopped working.
Your boiler is failing to ignite because it is not receiving the signal to start the gas flow, meaning you will have no heating or hot water.
Your boiler has stopped working because it cannot light its internal flame or keep it burning.
Your boiler has encountered a temporary problem and requires a manual reset to restart its normal operation.
Your boiler has no power and the control panel lights are completely switched off.
Your boiler has too much water inside it, which is causing the safety valve to leak or trigger to protect the system from bursting.
Your boiler has stopped working because it failed to ignite, which could be due to a simple issue like a lack of gas or a more complex internal fault.
Your boiler has stopped working because it failed to light the flame or keep it burning.
Your boiler has switched itself off because it got too hot, which is a built-in safety feature to prevent damage or dangerous overheating.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes