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Thanks for all your help. All good info even if I don't understand all of it. Is the below situation correct? I'm beginning to think its the programmer. Everything seems to work but put it all together and it doesn't. HW and CH on. Cylinder temp low and satisfied. CH requesting heat. In...

no the valve is working as it should. The problem is when HW and CH is left ON the HW comes up to temp and then the system shuts off. Never goes back to CH. The gray wire seems to be connected to the CH thermostat...

Ah so when there's voltage its actually OFF. Makes sense. More testing ...

humm, think i've lost the plot. What voltage's should going through these wires? There seems to be no voltage on anything yet the central heating is on and working??!? turning hot water on puts voltage on the gray wire which puts the valve in the mid position. confused.com

okay, thats okay then. Checked white wire and no voltage when requesting heat. turning hot water off however sends the diverter valve to CH only?!?

Yeah i've just been checking that wire. I assume there should only be voltage on this when the cylinder thermostat is requesting heat. I turned the thermostat right down (heared a click) and there is still voltage on the gray wire. perhaps the thermostat is faulty? any way to test?

I recently changed the pump as it was blowing the fuse and since then i've had a few problems. Initally the diverter valve was getting stuck on hot water and wouldn't return to heating. This has now been replaced and functions correctly. However! With both heating and hot water ON and...