Red High

Grant Red Fault Code

Also written as RED — same fault.

The Grant Red fault code means: your boiler has stopped circulating water because the internal pump has jammed, meaning you currently have no heating or hot water.. It appears on 2 Grant models 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: Pump is stopped, Pump rotor blocked
Typical repair cost £150-£300 (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 Red fault code

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

Source

Grant 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 31 August 2026