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The lights are behaving as expected. B flashes intermittently when the boiler is off/cuts out and is lit continuously when the burner fires up. Light A remains off.

I have an Alpha CB28 combi boiler. When the heating comes on the boiler lights up for around 10-15 minutes but then it cuts out. It then keeps coming on and cutting out every 2 minutes. When the boiler cuts out there is still a whirring in the boiler (I think it's the fan?) but the burner goes...