Burner reset light orange/green alternate flash (0.5s) High

Grant Burner reset light orange/green alternate flash (0.5s) Fault Code

Also written as BURNERRESETLIGHTORANGEGREENALTERNATEFLASH05S — same fault.

The Grant Burner reset light orange/green alternate flash (0.5s) fault code means: your boiler's computer memory has developed a permanent internal fault and can no longer process the commands needed to fire the burner.. 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: EEPROM failure — faulty internal memory, replace control box
Typical repair cost £250-£400 (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 orange/green alternate flash (0.5s) fault code

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

Source

Grant Burner reset light orange/green alternate 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