BoilerFaultCodes CH PUMP indicator Slow flash High
Boiler Fault Code CH PUMP indicator Slow flash
Also written as CHPUMPINDICATORSLOWFLASH — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code CH PUMP indicator Slow 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 internal control brain is experiencing an electronics failure and can no longer reliably signal the system to move hot water around your home. (As reported on Grant Vortex Eco)
Pick your boiler brand for the CH PUMP indicator Slow flash fix
Source
Information for the CH PUMP indicator Slow flash fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026