Boiler Fault Code SERVO MOTOR BLOCKED

Also written as SERVOMOTORBLOCKED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code SERVO MOTOR BLOCKED appears across 1 boiler brand and 1 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 the mechanical part responsible for feeding fuel into the fire is stuck, likely due to a build-up of ash residue. (As reported on Grant Spira)