Burner reset light red/orange inverted flash (2.5s on, 0.5s off) High

Grant Burner reset light red/orange inverted flash (2.5s on, 0.5s off) Fault Code

Also written as BURNERRESETLIGHTREDORANGEINVERTEDFLASH25SON05SOFF — same fault.

The Grant Burner reset light red/orange inverted flash (2.5s on, 0.5s off) fault code means: your boiler's internal cooling and combustion fan has stopped working, preventing the burner from starting up safely.. 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: fan motor error — faulty or disconnected fan motor
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 Burner reset light red/orange inverted flash (2.5s on, 0.5s off) fault code

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

Source

Grant Burner reset light red/orange inverted flash (2.5s on, 0.5s off) 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