11 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Mexico HE
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. 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 |
|---|---|---|
| 41-392-31 | Mexico Super 4100 FF | 2001–2006 |
| 41-392-32 | Mexico Super 4125 FF | 2001–2006 |
| 41-392-78 | Mexico Super RS 4125 | 2001–2006 |
| 41-392-79 | Mexico Super RS 4100 | 2001–2006 |
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Your boiler is failing to start because it cannot successfully turn on the small initial flame required to ignite the main burner.
Your boiler's pilot light is failing to remain on, which means the safety system is cutting the gas supply to prevent unburnt gas from filling your home.
Your boiler has successfully lit its small starter flame, but the main burner is failing to ignite because the gas valve is not opening to supply the necessary fuel.
Your boiler is failing to start up because the small ignition flame is not lighting properly.
Your boiler is failing to keep its small starter flame lit, which prevents the main heating system from firing up.
Your boiler's small pilot light has started, but the main burner is failing to ignite to provide heating and hot water.
Your boiler's temperature control dial is not communicating correctly with the main system, meaning the boiler cannot determine the correct heat output.
Your boiler has failed to ignite the burner, meaning it is currently unable to provide heating or hot water because it cannot detect a flame.
Your boiler has detected an internal issue with its electronic control system and requires a professional to evaluate the main circuit board.
Your boiler's electronic brain is experiencing an internal communication error and has safely shut itself down to prevent unpredictable operation.
Your boiler has failed to ignite the gas flame after three attempts and has locked itself out for safety reasons.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes