The system was working before the programmer become faulty however we hadn't used the boiler or a while. Good idea with immersion heater need to check that out, thanks.
Thanks for all the help people have given me help on here, its appreciated. I tested the three port using these instructions:-
Shut off the power supply to your central heating system. Don’t simply turn things off at the programmer, as the valve will still carry live current and the test won’t...
I have a gas boiler in the attic and a cylinder water tank in the airing cupboard.
The programmer Danfoss FS715 started going faulty so I managed to buy a Danfoss CP715 to replace as its easy they just plug in to the backplate.
However after installing the CP715 and making sure the dip...