20 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 |
|---|---|---|
| 47-393-08 | Performa 28i | 2001–2006 |
Tap any card for details
Your boiler has detected an issue with its internal safety checks involving the fan and air flow, meaning it cannot safely ignite to provide heating or hot water.
Your boiler has detected that water is not circulating correctly through the system, preventing it from firing up to heat your home or water.
Your boiler has detected a problem with how it clears waste gases, which prevents it from firing up for your heating or hot water.
Your boiler has detected a problem safely moving waste gases out through the flue pipe, which has caused it to shut down for safety.
Your boiler has detected a general ignition or flame failure, meaning it has temporarily stopped working for safety.
Your boiler has detected that the fan, which safely clears waste gases away, is not spinning as fast as it needs to for the boiler to light safely.
Your boiler has stopped working because water is not moving through the system properly, likely due to a stuck pump or a blockage.
Your boiler is lighting but cannot detect that the flame has been lit, causing it to shut down shortly after for safety.
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
Your boiler is starting up briefly but then failing to detect a flame, causing it to shut down for safety.
Your boiler has detected a system error or internal failure that is preventing it from starting up correctly.
Your boiler is failing to register that water is flowing through the system, which prevents it from igniting to provide heating or hot water.
Your boiler is failing to stay lit because it cannot detect that a flame has been successfully established.
Your boiler is trying to start the fire needed to heat your water but is failing to detect a flame after several attempts.
Your boiler's control switch is currently stuck in the reset position, preventing it from starting up normally.
Your boiler has detected an issue with its internal airflow system and has shut down as a safety precaution.
Your boiler is struggling to detect the temperature of the water being heated, which means it has stopped providing hot water to your taps and shower.
Your boiler is struggling to breathe safely, meaning it cannot clear away exhaust gases effectively and has shut down to prevent any risk.
Your boiler is struggling to accurately measure the temperature of the water it is heating for your taps, which will likely prevent you from having a consistent supply of hot water.
Your boiler has stopped working because it failed to ignite the internal flame needed to heat your water.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes