Cold radiator


Postby Hightower1978 » Tue Apr 17, 2012 8:05 pm

Hello.

I am experiencing problems with a radiator failing to hear up correctly. The longer the heating is on the hotter the radiator gets but adjusting tvr has no affect. I hàve removed head to check pin moving freely, which it does, and also swapping head with radiator which works ok but no change. Inlet valve is open fully and no air in radiator so can only assume tvr valve is faulty somehow. Is it possible that it could be closed or is it more likely a blockage in pipework after valve?
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Postby htg engineer » Sat Aug 11, 2012 8:18 pm

Have you tried adjusting the other radiators lockshield valves, it may just be that the pipework to this radiator has more resistance (bends etc) try closing all lockshield valves fully then open 2-3 turns, Leave the problem radiator valves fully open and see if it's any better. You'll just be restricting the flow through the others and forcing the flow towards this radiator.
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Postby Hightower1978 » Sun Aug 12, 2012 3:49 pm

Thanks for the reply.

I've tried closing all the valves and leaving only the problem one open. This does make it marginally warmer but no where what it should be. Since my last post I have fully drained the system, removed the radiator and flushed through to clear. I also replaced the tvr valve as a precaution. Unfortunately when the system was filled it made no difference at all!

The only conclusion i can come to is that, as the inlet pipe is never hot, the pipe must be kinked or severely blocked. The radiator after the problem one is an extension so I wonder whether on installation that the pipe work was damaged.

Can you think of any way to test this theory other than knocking hole in wall? Suppose I could take of radiator before and problem one, then flush water through one before to see if water comes out at inlet for problem one?
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Postby htg engineer » Mon Aug 13, 2012 4:14 pm

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Postby Hightower1978 » Mon Aug 13, 2012 8:09 pm

Sorry, seems to be a problem with your last post.
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Postby htg engineer » Tue Aug 14, 2012 6:05 pm

It does seem like there's some restriction there, you say you have changed the TRV, but have you checked the other valve? in case that's the problem.

What size pipe work?

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Postby Hightower1978 » Tue Aug 14, 2012 7:03 pm

Didnt change other valve but appeared to be fully opening and closing when checked. The pipe work is 10mm. Didn't completely think through whilst system was drained but did prove there was flow between the tvr end of the faulty radiator and the next one although didn't check inlet between one before and problem one.
Hightower1978
Posts: 9
Joined: Thu Mar 01, 2012 12:21 pm


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