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I pulled the pilot light assemby, and one of the nozzles was blocked inside the jet. Cleared that and its working out now. Should the nozzle be black on the inside? I did check the impedance for the electrode to the PCB, and it was 6ohms or so. I didn't check the gas pressure. I do have...

Just before Xmas the first signs of trouble were that the boiler wouldn't light at all: the fan came on and stayed on, the pump was running, the ignitor would click away, but the pilot light wouldn't ignite and the boiler would eventually trip on flame failure. Turn it all off and back on, try...