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Mend Ravenheat RSF84ET Boiler Diverter Valve Pcb

How can I fix my Ravenheat RSF84ET boiler?

On my Ravenheat RSF84ET boiler I haven't any DHW. I have replaced the diverter valve & microswitch, plus I have tried a new pcb all to no avail. I feel it may be the DHW potentiometer, but don't know how to test it ?

ARW
February 2011
RavenheatRavenheat RSF84ETKitchen Appliances, Electric CookersBoiler Diverter Valve Pcb

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Ravenheat RSF84ET Boiler - No Hot Water Fix