Burner reset light red flash (0.5s) High

Grant Burner reset light red flash (0.5s) Fault Code

Also written as BURNERRESETLIGHTREDFLASH05S — same fault.

The Grant Burner reset light red flash (0.5s) fault code means: your boiler has stopped because it thinks it sees a flame when there shouldn't be one, which is usually caused by a dirty sensor or an incorrect air-to-fuel mix.. 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: Lockout: false flame signal during operation — badly adjusted burner
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 Burner reset light red flash (0.5s) fault code

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

Source

Grant Burner reset light red flash (0.5s) 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