How much does it cost to fix Grant error code RED?

Typical repair cost for the Grant RED fault is £120-250 including labour.

RED High

Grant RED Fault Code

Q: What does the Grant RED fault code mean?

Your boiler has stopped working because it failed to ignite or stay lit, requiring an internal safety reset.

The Grant RED fault code means: your boiler has stopped working because it failed to ignite or stay lit, requiring an internal safety reset.. It appears on 5 Grant models in our database.

Technical description: Burner lockout (constant red)

Typical repair cost £120-250 (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.

Vortex 15-20 Repair: £120-250
Vortex 20-26 Repair: £120-250
Vortex Eco Repair: £120-250
Vortex Eco External Floor Standing Repair: £120-250
Vortex Pro 15-26 Repair: £120-250

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 27 April 2026