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Hi Dan, thanks for the reply. Went back to recheck the voltages and the 150 volts to the fan had disappeared! I then checked the voltages across Pin 11 and Pin 8, no volts?? I removed the controller and lifted off the plastic covers and found that the pcb was badly scorched around Relay...

I am round at a house of a young lady in Sussex and she has been without central-heating or hot water for 2 weeks! I have sorted the hot water using the electric immersion heater (on for 2 hours a day). Removed covers and notice that the Halstead Best 50 has a fan which does not start when...