Radiators will not turn off

BlueSkies · 19 May 2007

I have a Vaillant combi feeding radiators with (older) Westherm and (newer) Drayton TRVs.

A problem that has recently made itself apparent (warmer weather, = heating not required in bedrooms), is that I cannot turn off the individual radiators using the TRV's. Flow direction seems correct (ie TRV pipe warms first). Several radiators are affected.

System seems OK otherwise.

Any suggestions welcome.

weareleeds · 19 May 2007

Probably faulty rad valves passing

DIYsaster · 19 May 2007

first thing to do is check that the trv heads are screwed(if screw on types) tightly onto the main bodies, they can loosen and even though they appear to be turned off, still won't press the spindle all the way down, thus not closing off the water flow. there should be a (usually silver) threaded union half way down the complete valve which can be unscrewed to remove/inspect/clean the head . no drain down required. hope it is as simple as that and this helps. failing that, YEP them valves be passing and need replacing.

dal5band · 20 May 2007

I think the start and/or end position of the control head is adjustable - yours may be set so that even when fully turned to close, the valve pin (spindle) is not fully pressed down. remove the head and look for adjustment, end stop etc. You test the valve body by pressing the pin down with a metal tool to so if this closes the flow. Originally the valves used to come with a plastic cap that screwed on in place of the head - get one of these to test the valve closure.

BlueSkies · 22 May 2007

Thanks dal5band and DIYasater. Three of the valves were quickly 'fixed' by tightening as you suggested, and two others are suspect, possibly faulty. I'll replace these next time I have to drain down the system.

Thanks again.

stumpynut · 22 May 2007

Try interchanging the heads, may be just the head thats knackered, no need for drain down

diynot

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Radiators will not turn off

BlueSkies

weareleeds

DIYsaster

dal5band

BlueSkies

stumpynut

DIYnot Local

Similar threads