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From left to right when programmer CH on and Off CH off CH On T1 043 245 red and blank T2 060 070 yellow and brown T3 244 245 yellow and grey and green/yellow T4 050 245 yellow and white T5 060 070 red...

I have got a multimeter now. I will check which one is always live. When you say post a list of what each pair is connected to, you mean check the voltage ? I understand power to wiring cabinet will need to be on but what the controls on programmer , does it matter and can HW and CH be...

vavle seems to be moving fine so I am going through the wiring. Couldnt get past the first CH only test: white wire is connected to T4, I have moved it to T1 which was empty grey wire was on T3, as soon as I moved grey wire, I heard something moving in the valve. I have set it to T1 as...

Found the spindle, it doesn't seem sticky at all and moves a tiny bit on each side not much, even with pliers in only moves a tiny bit. Put actuator back on and CH worked fine on its own for 10 mins before we went back to square 1. So opened it up again and it seems that spring action only...

back to how it was :-( I am going to try what you said about turning the spindle.

It has been working alright now since the "fiddle". HW and CH both come on separately and together. However I was woken by loud pump noise yesterday, lowered the thermostat on boiler and it went quiet.

I have been flicking the valve to MAN and AUTO a few times. Did a little tap with a mallet a few as suggested in another thread. HW is off and CH is on and the boiler has fired up. Been like this for last 15minutes. Radiators are warming up and I now which pipe you were on about, its...

radiators were hot and stayed for about an hour but all gone cold now. Boiler not firing up staying on blue, no green light. Does the VALVE setting need to be in middle or on AUTO [far left] Pics below and all pipes are cold

After reading other forums, I have figured out that the actual model is V4073A1039 Is it worth replacing this valve on my own ?

thanks, its gone off and everything seems cold, probably because water has reached its highest temperature. Lever has little or no resistance when I try and move it from AUTO to MAN and back. You will need to tell me which one is return pipe please

Hi Guys, hoping someone will guide me in the right direction. I have recently bought a new place and heating seem to be working ok till a couple of days ago. I have been doing a lot of reading to familiarize myself with heating system. Problem: CH comes on when HW is water and once water...