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Fuse F1 on PCB 40 keeps blowing as soon as you turn on the Boiler (turning on hot water tap). Originally tried a new PCB 40 - no change so re-fitted the old on. Changing the fan spead control board has helped. now the fuse only blows when the fan should start working. Tried a new Fan - no effect (re-fitted the old one)
Any help welcome
Any help welcome