Central Heating Issue

A

ART1990

New Member
Hi all, Looking for some advice and to see if anyone has experienced the issue I'm having with Central Heating. Two up Two down house, around a year ago I noticed the downstairs radiators were not working. As winter is approaching, I called a Plumber to come take a look, he advised a new boiler as the one I had was very old. New boiler fitted, same issue with the radiators downstairs, freezing cold. He's since tried using Sludge cleaner on the system and it hasn't really worked. Only two of 3 radiators upstairs work, and down stairs are all freezing. I have to close all radiators off bar 1 (that I want to heat) for it to work. When all Valves are open only two radiators work and the rest don't. Tried balancing, tried bleeding. Plumber is now talking about repiping, but I'm worried I could pay for that and it still not be the issue. Any advice or experience with similar?

Thanks.
 
Where is the pump situated ?
What type of system do you have ,sealed & pressurised ,or fed from a loft tank ?
Got a hot water cylinder ?
 
You mentioned around a year ago you noticed downstairs rads were not working,prior to that did every radiator on the system heat fully ? If so ,what had been changed / altered on the heating system ?
 
terrymac said:
You mentioned around a year ago you noticed downstairs rads were not working,prior to that did every radiator on the system heat fully ? If so ,what had been changed / altered on the heating system ?
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Yeah initially it all worked fine. Can't think of anything in particular that changed, aside from a very much Ageing boiler. Thanks for responding by the way.
 
If you close the TRV ( Thermostatic rad valve) on the two rads that heat fully, what's the result on all the rads that do not heat ?
If you close every TRV ,but leave one downstairs radiators TRV fully open ,does that rad now heat fully ?
 
terrymac said:
If you close the TRV ( Thermostatic rad valve) on the two rads that heat fully, what's the result on all the rads that do not heat ?
If you close every TRV ,but leave one downstairs radiators TRV fully open ,does that rad now heat fully ?
Click to expand...
So if I close the Rads that work I'll start to get heat to the back bedroom but downstairs still cold. If I turn them all off bar the large one in the living room, it starts to heat. To me that should rule out a blockage in the pipework? It's just not getting to them all at the same time when all open.
 
Sounds like an issue with the pump.
If you can get every radiator to heat fully, individually with all others off, then the pipework to each one can't be blocked.
 
terrymac said:
Sounds like an issue with the pump.
If you can get every radiator to heat fully, individually with all others off, then the pipework to each one can't be blocked.
Click to expand...
Recently had a new Boiler fitted, would this not include a new circulating pump
 
It's a combi boiler. Its just difficult because plumber is saying they need to repipe some of it but I feel like I'll throw more money at that and still be in the same position.
 
ART1990 said:
Recently had a new Boiler fitted, would this not include a new circulating pump
Click to expand...
Yes ,combi has pump within it. Just because it's new doesn't mean it can't be duff.
Can EVERY radiator be made to heat fully ,by turning all the other rads off, trying each in turn ? If so ,as already advised,the pipework can't be blocked.
 
Or not fully blocked. If there is some flow like that at least (only one rad on at a time), it would provide a route for a chemical cleaner like x400 to do its job.
 
I recently had a new boiler fitted & was told that I had to have a complete system clean otherwise it would affect my warranty. I just would have thought that with the problems you are having the system would have been cleaned? Or am I wrong?
 
Jimbo said:
Or not fully blocked. If there is some flow like that at least (only one rad on at a time), it would provide a route for a chemical cleaner like x400 to do its job.
Click to expand...
Yeah they've put x400 through the system and hasn't worked :-(
 
Did they make it go through each radiator in isolation?

does the system have an external bypass valve fitted anywhere?
 
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