What the manual says
Manufacturer manualTemporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
From this model's manual
This code was read directly from the manufacturer service manual for this model.
DIY fix possible
Monitor the boiler to see if it clears the fault and restarts automaticallyCheck that other gas appliances in the home are working correctlyIf the fault persists and turns to red flashes, attempt a manual resetEnsure the condensate pipe has not frozen if the weather is extremely cold
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