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
Check that your gas supply is turned on (check other gas appliances)Press the reset button once the boiler stops attempting to restartMonitor the boiler to see if the fault progresses to a solid red light
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