Boiler Fault Code CH PUMP indicator Fast flash

Also written as CHPUMPINDICATORFASTFLASH — same fault.

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

Fault code CH PUMP indicator Fast flash appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's temperature sensor is failing to communicate properly, which is preventing it from heating your water correctly. (As reported on Grant Vortex Eco)