Technical description
Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
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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