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Hello again, The flow switch has been checked for continuity and it's working fine (i.e. LED2 comes on and zero Ohms is measured across the flow switch when the hot tap is turned on). As the thermistors have been replaced, do you think the fault is likely to be the control board, and/or...

Thanks, Tony. Would this be the Flowmeter referred to in the manual? Other than that, I can't see a specific flow sensing device. Regards, Pete

Hello Can anybody please help with the following problem I have with my FER Hawk combi boiler? The boiler will not fire up for DHW when the CH is not on and the boiler is stone cold. It works fine when the CH is on, and for a while thereafter. Both CH and DHW thermocouples...