Hi guys.. Just checked the trv pin on one of my rads and it just lifts up instead of bouncing up and down in a spring motion. The pipe is cold but the other pipe (feed I think) is piping hot and the rad is hot at top and cool at bottom.. Would the pin be the issue if its not springing up and down?
Trv pin not bouncing up and down!
- Thread starter Abs4190
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Sounds as though the valve may be stuck to its seating, probably new valve time.
Mine was jammed. The head was OK, but you couldn't press the pin down manually, no matter how hard you pressed.
Removed the valve body and dismantled it - there was a piece of black "grit" jammed in the seat which was stopping it from actuating. The "grit" was very likely a piece of magnetite that had dislodged from the (cast iron) heat exchanger or perhaps froma radiator.
Reassembled it and it's fine to this day.
Removed the valve body and dismantled it - there was a piece of black "grit" jammed in the seat which was stopping it from actuating. The "grit" was very likely a piece of magnetite that had dislodged from the (cast iron) heat exchanger or perhaps froma radiator.
Reassembled it and it's fine to this day.
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Using the handle of a hammer, tap the valve body level with the 90o angle of the valve, with the head off. You could also try a gentle tap on the pin itself, with a drift in between the pin and the hammer.
post a pic of the valve please so we know which one you have they are not all the same
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A bit late to the thread but this may help someone. Had the same issue, pin moved freely but didn’t spring back up. Pipe was warmish beneath TRV but radiator cold, after tapping it with hammer and pulling pin up and down with pliers with no success thought it was knackered and would need replacing. Then after assuming pin had become disconnected from valve I pushed down hard on the pin a few times and noticed pipe getting hotter. Moving pin up and down again noticed radiator started to warm, after a few minutes the pin was springing back open like normal.
Guess it some how got stuck down and pin became disconnected, but once the water was circulating through it sorted itself.
Guess it some how got stuck down and pin became disconnected, but once the water was circulating through it sorted itself.
Exactly what I did a couple of days ago when the mother-in-law came to visit and the radiators in the spare bedroom were flat cold. I'd left the TRVs on 0.
I used to have to do that with mine every winter but now, in summer when the heating goes off, I leave all my TRV's fully open.
I have a similar problem now. PIn has very little movement but some, so valve wont fully close. I've tried gently tapping, WD40, pliers to wiggle pin, but no good. Anything else I can try?? Photo attached so you can see what valve it is.
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Replace it.
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I created an account to thank you for this! Spent hours googling this on and off - almost went to a plumber to do a drain and replace. This did it. Gentle push in past the perceived limit - it sprung back and heat started to move in.
For the record - no amount of banging helped.
Now that I think of it, I might have done this last year inadvertently too, and lost all memory of it.
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