DHW PUMP panel LED flashing fast (2/sec) High

Grant DHW PUMP panel LED flashing fast (2/sec) Fault Code

Also written as DHWPUMPPANELLEDFLASHINGFAST2SEC — same fault.

The Grant DHW PUMP panel LED flashing fast (2/sec) fault code means: your boiler's hot water sensor is reporting an error, meaning the system cannot accurately measure the temperature of the water being stored.. 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: Store thermistor fault — check connection or replace thermistor
Typical repair cost £120-190 (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 fast (2/sec) fault code

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

Source

Grant DHW PUMP panel LED flashing fast (2/sec) 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