joneh
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| posted on 14/12/08 at 09:59 PM |
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OT Central heating
Any plumbers in the house?
My lounge radiator is cold. The others in the house are warm. I've replaced both valves and cleaned the radiator out. The inlet valve gets
hot but the rad and outlet remain cold. I've drained the entire system (through the drain which is below the outlet valve on the offending
radiator) so I'm fairly sure its not blocked.
I'm wondering if the system need balancing, but I've turned all the other rads off (apart from the bathroom) and its still cold.
Edit: This is the last radiator in the loop and both valves are fully open.
Any ideas?
Thanks,
Jon
[Edited on 14/12/08 by joneh]
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owelly
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| posted on 14/12/08 at 10:04 PM |
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When you open the bleed, what comes out?
http://www.ppcmag.co.uk
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ReMan
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| posted on 14/12/08 at 10:05 PM |
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Is it properly bled?
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joneh
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| posted on 14/12/08 at 10:06 PM |
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Yup, all bled. No air in any of the rads - even after draining.
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owelly
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| posted on 14/12/08 at 10:08 PM |
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But are you getting hot water out of the bleed?
The other possibility is that your pump has given up and the other rads are been fed via the magic that is convection.
http://www.ppcmag.co.uk
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joneh
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| posted on 14/12/08 at 10:12 PM |
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No the radiator is cold and so's the bleed.
The pump works as I can hear it moving the water around. It's definatley not convection!
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owelly
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| posted on 14/12/08 at 10:14 PM |
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Have you tried bleeding a lot of water through it? As the rest of the system is hot, you should get hot water through!!
http://www.ppcmag.co.uk
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ruskino80
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| posted on 14/12/08 at 10:16 PM |
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possible blocked valve-if you can turn off both valves take of the rad and flush through then without the rad there but a bucket in place open the
valves and make sure we have flow there.
if you have light carpets then dont do this unless you are confident!
also is one of your valves thermostatic? if so try tapping it with a spanner-sometimes the pin inside can jam.
[Edited on 14/12/08 by ruskino80]
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joneh
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| posted on 14/12/08 at 10:17 PM |
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I don't get what that will do?
I get hot water in it's not coming out the other end, or it's not hot enough going in not sure...
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owelly
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| posted on 14/12/08 at 10:18 PM |
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He's replaced both valves
http://www.ppcmag.co.uk
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MikeR
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| posted on 14/12/08 at 10:18 PM |
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i had this exact problem. Tried to fix it for years. Bled the system, flushed the system. did everything.
Eventually i decided it must be the pipe work. Started cutting it back and luckily after about 12 - 18 inches i found a blockage in the radiator. This
stopped 90% of the flow and hence it took nearly all day to get warm.
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joneh
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| posted on 14/12/08 at 10:22 PM |
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Bugger it - time to phone the experts I think!
Thanks for the ideas chaps.
I don't think its blocked as I get flow from both sides - inlet on right and gravity system drain on left.
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ruskino80
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| posted on 14/12/08 at 10:24 PM |
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hot water trying to flow in but if the cold cant flow out? draining to fit new valves etc can certianly create debris in pipework and can easily
block a brand new valve and it wont take much to do it.
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joneh
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| posted on 14/12/08 at 10:27 PM |
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I only drained it all to try and fix it. I've put cleaner in it for the week help defur the rest.
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ReMan
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| posted on 14/12/08 at 10:31 PM |
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Sounds like the rad is blocked. Y[ou should be able to bleed it until it bleeds hot water
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Danozeman
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| posted on 14/12/08 at 10:46 PM |
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Has it got a t piece in the pipe on the outlet? Could be blocked there??
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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MkIndy7
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| posted on 14/12/08 at 10:53 PM |
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The best method for Diagnosing or testing radiators like this is to close both valves and relieve the pressure in the rad through the bleed key.
Then take either the air release valve or the blank at the other end completely out and attatch a suitable 1/2" fitting with a valve of some
sort and connect this to a hose pipe or direct it into a large bucket.
With the new bleed valve closed, open one radiator valve.
Open the bleed valve and continue to draw water through until it is very hot, at which point close the bleed valve followed by the radiator valve.
Now repeat the process with the other radiator valve.
This will tell you if either the flow or return leg or the radiator itself has any blockages, you may well get large pockets of air out this way which
would othewise be stuck venting with the small air tap as water can be "pulled over the pocket of air".
You will of cause have to have a helper topping up the system as you bleed it if it's a pressurised system.
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austin man
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| posted on 14/12/08 at 11:12 PM |
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its got to be valve related especially if you can bleed the sytem and fill the rad with water, this would indicate that water is getting in to the rad
. You could always drain the rad again then open one vale to see whether the rad starts to fill then repeat the proces. Thermostatic valves can be
very tempremental so if you have one again suggest a slight tap with a hammer.
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gasmark1
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| posted on 14/12/08 at 11:53 PM |
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heating
as you can see by my username this is my bag.has the rad ever been hot ?why did you change valves what sort of system do you have
openvent,sealed,gravity hot water pumped CH let me know and i might be able to help you .
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