22 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Solo 3
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 |
|---|---|---|
| 41-075-65 | Solo 12 HE A | 2010–2015 |
| 41-075-66 | Solo 15 HE A | 2010–2015 |
| 41-075-67 | Solo 18 HE A | 2010–2015 |
| 41-075-68 | Solo 24 HE A | 2010–2015 |
| 41-075-69 | Solo 30 HE A | 2010–2015 |
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Your boiler's internal computer brain has developed a fault and can no longer control the heating process safely.
Your boiler's main internal control board has developed a fault and can no longer send signals to operate the heating safely.
Your boiler has detected an issue with its internal fan or the air flow required for safe operation, causing it to shut down for safety.
Your boiler is not receiving enough electrical power to operate properly, likely due to a fault in your home's wiring or a power supply issue.
Your boiler has likely stopped working because it has exceeded a safe temperature limit and triggered a safety shut-down.
Your boiler has stopped working because of a loose connection or a fault in the internal electrical wiring that links its control parts together.
Your boiler's internal computer has developed a fault and is no longer able to control the heating process safely.
Your boiler has detected that it is trying to heat up without enough water flowing through it, causing it to shut down to prevent overheating.
Your boiler has detected a problem with its internal temperature sensors and has stopped working to prevent damage.
Your boiler's internal control board has developed an electrical fault and is no longer able to manage the heating process safely.
Your boiler has detected that it is heating up internally without enough water flowing through it, causing it to shut down to prevent damage.
Your boiler has detected a temperature sensor fault, meaning it can no longer accurately monitor how hot the water is getting.
Your boiler has detected that the electrical wiring coming into the unit is connected backwards, which is a safety risk and prevents it from starting.
Your boiler's main internal computer has developed a fault and is no longer able to control the heating process safely.
Your boiler has detected that the fan, which safely clears waste gases away, is not spinning correctly and has shut down the system for safety.
Your boiler has tried to light several times without success and has now shut itself down for safety.
Your boiler has no power reaching it, which means the system cannot start up to provide heating or hot water.
Your boiler is not receiving the signal from your thermostat or programmer to turn on, meaning it thinks it doesn't need to heat your home.
Your boiler has tried to light several times but failed, so it has locked itself out for safety.
Your boiler has detected an internal electrical communication error, likely caused by a loose wire or a fault with the main control board.
Your boiler has shut itself down because it has become too hot to operate safely.
Your boiler has detected that its temperature sensor is not working correctly, which means it cannot tell how hot the water is and has stopped running for safety.
BoilerFaultCodes