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not sure how motorised valves there are. There's a fused spur controlling the boiler itself, with a 3 amp fuse. i've changed the fuse but it still doesn't work. I would like to test the plug that connects into the boiler itself, but am afraid i'll damage it. I can't hear anything running

Hi, Hoping someone can help. The pilot light comes on when i switch the Switchmaster to "constant" nothing happens. Seems like the electricity supply has gone array. I have a digital tester but am unsure where to start. Any help is greatly appreciated.