Boiler Fault Code 135

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code 135 appears across 3 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because it cannot light the internal flame, which is often caused by a blocked gas supply, a power issue, or a faulty ignition component. (As reported on Main Eco Compact System)