How much does it cost to fix Grant error code Flashes red?

Typical repair cost for the Grant Flashes red fault is £250-450 including labour.

Flashes red High

Grant Flashes red Fault Code

Q: What does the Grant Flashes red fault code mean?

Your boiler has stopped heating because the internal water pump, which moves hot water around your house, has seized up or failed and cannot restart itself.

Also written as FLASHESRED — same fault.

The Grant Flashes red fault code means: your boiler has stopped heating because the internal water pump, which moves hot water around your house, has seized up or failed and cannot restart itself.. It appears on 5 Grant models in our database.

Technical description: Pump not operating. Pump stopped (blocked). Pump does not restart itself due to a permanent failure.

Typical repair cost £250-450 (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 Flashes red fault code

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

Source

Grant Flashes red 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 27 April 2026