26 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Baxi Solo 3 HE
This boiler uses indicator light combinations
Note which lights are on, off, or flashing and at what speed. Match the combination to the cards below. Do not reset until you have noted the pattern. 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 |
|---|---|---|
| 41-075-04 | Solo PF 3 30 | 1999–2001 |
Tap any card for details
Your boiler has detected that the electrical wiring coming into the unit is connected the wrong way around, which is a safety risk.
Your boiler has detected that the fan, which safely clears waste gases, is not spinning correctly or has become jammed.
Your boiler is not receiving enough electrical power from your home's mains supply to operate safely.
Your boiler has switched itself off because it has gotten too hot, which is a safety mechanism to prevent damage.
Your boiler's internal computer has suffered an electrical failure and can no longer control the heating process.
Your boiler's internal computer has suffered a critical failure and can no longer control the heating process safely.
Your boiler has detected that it is trying to heat up without enough water inside it, which could cause the unit to overheat.
Your boiler has detected a faulty temperature sensor, which means it cannot accurately measure how hot the water is and has stopped running as a safety precaution.
Your boiler has detected that the electrical wiring coming into the unit is connected backwards, which is a safety risk and prevents the system from starting.
Your boiler's internal computer has suffered a hardware failure and can no longer control the heating process safely.
Your boiler has detected that it got too hot or lost power, so it has automatically turned itself off to stay safe and needs to be reset.
Your boiler is signalling that it is trying to light, but it is encountering a blockage or electrical issue that prevents the fuel from flowing correctly.
Your boiler is likely shutting down because it has reached its maximum safe temperature or has a fault within its internal control board.
Your boiler has stopped working because the fan used to clear exhaust gases is not spinning correctly or communicating with the control board.
Your boiler has tried to light itself five times without success and has shut down for safety purposes.
Your boiler appears to have no power reaching it at all, meaning the control lights are off and it cannot start up to provide heating or hot water.
Your boiler has failed to light after several attempts and has locked itself for safety.
Your boiler has detected an internal communication problem between its electronic parts, meaning it cannot start up safely.
Your boiler has automatically shut down to protect itself, likely because it got too hot or experienced a temporary glitch.
Your boiler has likely stopped working because it reached a temperature that is too high, causing it to shut down for safety.
Your boiler has detected that it is running too hot and has automatically switched itself off as a safety precaution to prevent damage.
Your boiler has detected that it is running too hot and has automatically shut itself down to prevent damage.
Your boiler has switched itself off because it has reached a temperature that is too high to operate safely.
Your boiler has become too hot and has automatically switched itself off for safety to prevent damage.
Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent damage.
Your boiler has detected that a temperature sensor is giving an incorrect reading or has a faulty connection, which is preventing it from heating your water safely.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes