newdad said:chaps said:ChrisR said:CHeck the DHW microswitch by pulling (one of )its wires off. Water ingress can make them short.
i would agree with that, it may be moving in the right direction at the right time but internally it may be constantly in the hot water possition, i changed one exactly like this a few months ago, it didn't click when moved by finger either, it should !!!
The DHW microswitch clicks when pressed by hand then the pump starts and it fires up. It clicks again when released. I can't easily remove one of the wires to check...
The CH microswitch clicks when pressed by hand but the pump doesnt start and the boiler does not fire up. (it does when the CH is turned on and activated by the plunger.)
I have also just noticed that pressing the DHW microswitch activates the plunger in the CH which in turn operates the CH microswitch - is it supposed to do this?
i think you should call in someone qualified as there ISNT a c/h flow switch, its a pump sensing switch and your getting a bit confused, either way call someone in who's qualified, im sure they can sort it out quickly for you, switch on PCB