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Hello again, Have checked, and double checked all of the above suggestions ( APS, DHW/CH sensors, ect) the only other items unchecked are the potentiometers, and circuit PCB

H'i Folks, I have a Ravenheat RFS 84ET boiler, which is less than 3 year old and its packed up. I have no hot water, or heating. So I followed the fault finding chart in the manual to the letter, and have now arrived at the point where it says: check/change potentiometer, if not that, renew...