BoilerFaultCodesPotterton 3 green flashes Fault Code
Also written as 3GREENFLASHES — same fault.
The Potterton 3 green flashes fault code means: your boiler has lit correctly but the flame has unexpectedly gone out, which often means the system isn't getting enough fuel or the sensor can't tell the fire is lit.. It appears on 1 Potterton model in our database.
Technical description: Flame Loss warning
DIY fix possible
Check if your gas supply is active by testing another gas appliance like a hobEnsure your gas meter has credit if you use a prepaid meterSwitch the boiler off and on again using the main power switch to see if it resets
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A cover plan would handle faults like 3 green flashes: no call-out fees, no surprise bills.
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Potterton models that show the 3 green flashes fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Potterton 3 green flashes fault code information on this page is sourced and cross-checked against the official Potterton service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026