11 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 →
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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 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 tried to light several times without success and has now shut itself down for safety.
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.
BoilerFaultCodes