DHW PUMP panel LED flashing slow (1 per 2s) High

Grant DHW PUMP panel LED flashing slow (1 per 2s) Fault Code

Also written as DHWPUMPPANELLEDFLASHINGSLOW1PER2S — same fault.

The Grant DHW PUMP panel LED flashing slow (1 per 2s) fault code means: your boiler’s internal control board has suffered an electrical component failure and can no longer operate the hot water pump.. It appears on 1 Grant model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: PCB relay fault — replace PCB
Typical repair cost £350-£550 (including labour)

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 DHW PUMP panel LED flashing slow (1 per 2s) fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Grant DHW PUMP panel LED flashing slow (1 per 2s) 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