Yes and I've solved it. I had no voltage on the white wire to the valve so I chased the wire back and found a poor contact in the "rats nest"...
I have a sealed pumped system with a nearly new Vaillant system boiler. Controls are a Honeywell THR860SUK 2-channel programmer, honeywell...
Well thanks for the compliments blertsville !! If you had looked at my first post you would see I tried that. Now I've replaced the head he's...
Well it's nil points ( you can do the french accent ) all round. With the new head the system still stays on permanently. My installer is...
The replacement head has arrived so I'm committed. The wiring in the main box is so crammed I'm going to cut the original fly lead and use a...
I think that, thanks to your patience, I have arrived at the point where I have to replace the head. Like you, I'm not any of the things you...
The valve is a Honeywell. Should I count this as a "helpful" too ?
Now I understand why you suspect the valve. I work in the steel industry and we have to do a lot of problem solving using Kepner Tregoe eg. you...
Thanks once again; you deserve a medal. Before I do that I had a think (at about 2.00 am ) Is there a device which is "king" and is able to...
Hmmm. As usual, a lot of sense in what you have to say. I have just used the hot water and it's much hotter than it should be which concurs...
Addendum. With the main switch and programmer off I pushed the valve to the CH end then switched on the main switch. The valve stayed where it was.
I should be shot. I owe all you guys a big apology. I have been assuming that because the pump in the airing cupboard has been running that the...
Thanks everyone for all your help. I tried another experiment. I left the HW on for an hour ( we need hot water ) then switched it off at the...
You can see why I asked for some help ! There is one other clue. With CH and HW off at the programmer provided I don't let anything get warm...
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