13 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 |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
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 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 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 likely shutting down because it has reached its maximum safe temperature or has a fault within its internal control board.
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 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 shut itself down to prevent damage.
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.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes