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 Post subject: Cold radiator
PostPosted: Sat Jan 19, 2019 8:13 pm 
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Hi, the living room radiator in my son's house is not getting warm. He says he has tried bleading it and no air, just water came out. The feed pipe is warm up to a couple of yds from the radiator but then gets cold before it reaches it. Unfortunately he lives a couple of hundred miles away so I haven't seen it, just what he has told me over the phone. Any ideas ? Thanks


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 Post subject: Re: Cold radiator
PostPosted: Sat Jan 19, 2019 8:25 pm 
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Sounds like a blockage in the pipe.

Are the valves open both ends?

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 Post subject: Re: Cold radiator
PostPosted: Sat Jan 19, 2019 8:47 pm 
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He says he shut both valves off and opened them again so they are turning ok. If there was a blockage would water still come out of the bleed screw. Enough came out that he had to re pressure the combi. Thanks


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 Post subject: Re: Cold radiator
PostPosted: Sat Jan 19, 2019 9:37 pm 
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I am NOT a heating engineer.

As I understand it, with a combi it is a sealed system. If one pipe is blocked and you make a hole in the system (Open the bleed valve) then there is nothing to stop water coming from the other side of the blockage.

I would be tempted to take the rad off and open each valve in turn*

You should get lots of water come out so you will need a wide bowl or loads of old blankets, and even a plastic sheet on the floor first.

As the rad is off take it outside and put a hose on it and bang it with rubber hammer.

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 Post subject: Re: Cold radiator
PostPosted: Sun Jan 20, 2019 5:21 am 
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Op states pipe is warm 2 yards from rad then goes cold. Blockage must be here and not in rad.

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 Post subject: Re: Cold radiator
PostPosted: Sun Jan 20, 2019 8:30 am 
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Ktuludays wrote:
Op states pipe is warm 2 yards from rad then goes cold. Blockage must be here and not in rad.


I know that, but to try get the "blockage" out take the radiator off and open both valves (one at a time) and as the radiator is off it will not do any harm to hit it with a rubber hammer since it may be full of sludge that has backed up 2 yards down the pipe.

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 Post subject: Re: Cold radiator
PostPosted: Tue Jan 22, 2019 1:16 pm 
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Has it got a thermostatic radiator valve fitted?

If so, check the pin hasn't stuck shut before anything else.

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