2 port valve - heating with hot water

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mrdavidviner

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I'm sorry if this has been covered before, I'm trying my best to understand what's happening and I wonder if anyone could help.
The radiators are coming on when hot water is selected on the boiler. We have a 2 port valve near the cylinder and moves freely when hot water is selected, has resistance when central heating is selected. I thought this meant the valve is working correctly? I'd be happy to provide any information you might need.
 
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2 port valve are usually fitted in pairs the fault sounds like it is with the CH valve you need to track it down and see if that is stuck open.
 
Are you sure about the type of valve you've got. The lever is not an indicator to test your valve is operating correctly. Maybe a photo?
 
I'm not entirely sure, I will post a pic. Would the CH valve look similar, or better still where is it likely to be situated? I bow down to your helpfulness.
 
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Look at the pump there will be a tee in the outlet side one pipe will go to each valve you can trace the HW one so follow the other pipe to the identical valve should be somewhere along the CH run.

It will also have the same kind of 5core wire running to it.
 
Has this just started or has it always been like that? Beginning to sound like the valve is for heating and the hot water is uncontrolled.
 
It may sound stupid but since we had a new boiler and cylinder in around 4 years ago I'm convinced it's always happened but I can't be sure. We tend to keep the immersion on and turn the radiators off in the Summer.
 
Well maybe it's the couple of Budweisers I had earlier tonight but it's sounding like the way your system should run (slightly old fashioned but workable) is hot water anytime the boiler is on and the valve opens or closes the CH circuit.

From what you say that the valve is slack when hot water only and stiff when not it almost sounds as if it is wired wrong.

It looks very much as though either the system was wrong before your installer changed the boiler / cylinder or they screwed up the pipework or wiring when they did!

It is the sort of fault that is satisfying to sort out but you need to be there looking at it to suss out exactly what is going on, If you can get recommended to a good engineer he should be able to sort it, but I suspect it will involve a fair bit of expense.

Maybe one of the other teetotal engineers on here has some ideas :D

Come on gents any other suggestions? :confused:
 
We had a separate problem recently ( relay had gone in the boiler) and the guy did mention that he wasn't sure what the previous installer had done. If it helps I could post a couple of pics of the plumbing arrangement.

I hope it is a wiring problem as I don't mind having a go, but I'd rather leave the plumbing to the experts, although it would be interesting to know what exactly the problem is.

Thanks for your help.
 
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