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Yes I will do that, the valve must be 15 years + old. Thanks for all your help.

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.

Yes I tried that, 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'm getting no hot water, is there anything I can do? From what I have read the valve has probably jammed in the central heating position?

On the FP715 the two red lights are stuck on, nothing showing on LCD and buttons are unresponsive, I'm doing a test now to see if the water heats up.

This is what I have by the cylinder

Thanks for your reply, how can I tell its a Y plan?

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...