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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Central Heating Problem
Hi,
I am after a bit of advice about troubleshooting a central heating problem. I am not an expert so some of my terminology may be incorrect. From what I can make out, the system is fully pumped & vented. The problem is that when the system is on 'Hot Water Only', 3 of my downstairs radiators get very hot. The motorised valve head unit is clearly showing that it has shut off the radiator circuit. Adjusting the manual bypass valve does not seem to make any difference. What could my problem be? I thought perhaps it could be that the valve itself is not operating even though the motorised head is, or that the pump maybe running in reverse? Does anyone have any suggestions for how I might fix it? Thanks in advance. AJJ. |
#2
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AJJ wrote:
Hi, I am after a bit of advice about troubleshooting a central heating problem. I am not an expert so some of my terminology may be incorrect. From what I can make out, the system is fully pumped & vented. The problem is that when the system is on 'Hot Water Only', 3 of my downstairs radiators get very hot. The motorised valve head unit is clearly showing that it has shut off the radiator circuit. Adjusting the manual bypass valve does not seem to make any difference. What could my problem be? I thought perhaps it could be that the valve itself is not operating even though the motorised head is, or that the pump maybe running in reverse? Does anyone have any suggestions for how I might fix it? Thanks in advance. AJJ. Could you let us know if this is a new problem, i.e. has it only recently started occuring or has it always been this way? |
#3
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It has been like this for quite a while. I replaced the pump & the
valve about a year ago and am fairly sure it started happening at that point. The valve was certainly broken and the pump was so noisy I replaced it at the same time. AJJ |
#4
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"Richard Conway" wrote in message ... AJJ wrote: Hi, I am after a bit of advice about troubleshooting a central heating problem. I am not an expert so some of my terminology may be incorrect. From what I can make out, the system is fully pumped & vented. The problem is that when the system is on 'Hot Water Only', 3 of my downstairs radiators get very hot. The motorised valve head unit is clearly showing that it has shut off the radiator circuit. Adjusting the manual bypass valve does not seem to make any difference. What could my problem be? I thought perhaps it could be that the valve itself is not operating even though the motorised head is, or that the pump maybe running in reverse? Does anyone have any suggestions for how I might fix it? Thanks in advance. AJJ. Could you let us know if this is a new problem, i.e. has it only recently started occuring or has it always been this way? Classic symptom of the immersion reurn pipe not being connected to the heating return pipe "close" to the boiler. Oher causes may also be considered. |
#5
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I am not sure where the return pipes join but it is certainly not in
the vicinity of the hot water tank. I suspect it is close to the boiler but cannot check it without having the room apart. If they join a considerable distance away from the boiler is it possible the problem was worsened by installing a new more powerful pump? AJJ. |
#6
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In an earlier contribution to this discussion,
AJJ wrote: I am not sure where the return pipes join but it is certainly not in the vicinity of the hot water tank. I suspect it is close to the boiler but cannot check it without having the room apart. If they join a considerable distance away from the boiler is it possible the problem was worsened by installing a new more powerful pump? AJJ. What you *mustn't* have is some radiators returning one side and some the other side of the hot water return - they must all be on the *same* side - otherwise you can can get reverse circulation through some of the rads. If this problem started when you changed the 3-port mid-position valve, I would be inclined to suspect that there is some crud in the valve which is stopping it from closing off fully - allowing *some* CH flow in the HW-only position. -- Cheers, Set Square ______ Please reply to newsgroup. Reply address is invalid. |
#7
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There are certainly no radiators between hot water return and boiler.
I will take the valve out and check that it is closing properly. That'll have to wait until I have time to drain the system It is quite possible there is some crud in the valve as when I changed the pump it was full of crud. So much so that I was amazed it was working at all. The aperature size that was left for water to flow through was about 5 mm at best. Thanks for the advice. AJJ. |
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