thankyou, the company I used had a good name but sounds not, im thinking a pcb prob or programmer,it doesn't have a 3 way valve I think, its about 3 yrs old, thanks
Hi, I have had some probs recently and our heating engineer replaced pressure vessel thenpressure relief valve ,we have another prob as when my DHW running after it heats up the CH pump,kicks in when not called for my engineer doesn't know how to fix he said probly get a sparky looking for...