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i am currently training with a registered gass engineer, and we were at a job today which has stumped us. initial complaint- boiler does not fire and fan is cycling in speed, and no ignition. trusted mentor said that he had seen this before and could be pcb. Duly changed. result- fan...

can someone tell me how a standard single phase domestic boiler fan works. what type of motor it has, and how to test if it is sound or defective