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I thought this forum was for help and shared experiences. I fully accept you shouldn't mess about with GAS (unless qualified). However, the pcb is NOT located in the gas area of the boiler. It is located outside of the gas chamber, and taking the pcb off would NOT interfere with the GAS...

Hello I have one of these boilers. It is now not working. I suspect the pcb is faulty. When heat/water is switched on, the electrode starts to spark. The pilot comes on. You hear some whirling as well (it may be the fan, I don't know). The pilot stays on, and the sparking carries on...