BoilerFaultCodesGrant CH PUMP indicator Slow flash Fault Code
Also written as CHPUMPINDICATORSLOWFLASH — same fault.
The Grant CH PUMP indicator Slow flash fault code means: 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.. It appears on 6 Grant models in our database.
Technical description: Slow flash (once every 2 seconds): Indicates a possible fault with the PCB (relay). Replace PCB.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Grant models that show the CH PUMP indicator Slow flash fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Grant CH PUMP indicator Slow flash fault code information on this page is sourced and cross-checked against the official Grant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026