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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
Posted to uk.d-i-y
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Central heating won't turn off!
My system has started playing up. We noticed it when the weather turned
warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks |
#2
Posted to uk.d-i-y
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Central heating won't turn off!
On Sat, 29 Apr 2006 21:17:50 +0100, "Mike Lane"
wrote: My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks Look back to the 27th, post in capital letters. Same problem. |
#3
Posted to uk.d-i-y
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Central heating won't turn off!
In an earlier contribution to this discussion,
Mike Lane wrote: My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks The most likely diagnosis is that you have a zone valve which is either stuck open - even when turned off at the programmer - or the micro-switch, which provides its auxilliary contacts, has failed shut. [I am assuming that you have an S-Plan system, with separate 2-port valves for HW and CH rather than a Y-Plan system with a single 3-port valve?] Someone else reported a similar problem recently which turned out to be a failed pump over-run stat on the boiler. I have to admit that I'm struggling to understand how this would make the boiler fire - rather than just running the pump continuously - but it's nevertheless something else to check. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#4
Posted to uk.d-i-y
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Central heating won't turn off!
Roger Mills wrote:
In an earlier contribution to this discussion, Mike Lane wrote: My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks The most likely diagnosis is that you have a zone valve which is either stuck open - even when turned off at the programmer - or the micro-switch, which provides its auxilliary contacts, has failed shut. [I am assuming that you have an S-Plan system, with separate 2-port valves for HW and CH rather than a Y-Plan system with a single 3-port valve?] My Dad had a seized 2 port valve on the supply to the cylinder coil recently - try fiddling with the manual override lever on the side, if you do have such valves in your setup - it should be fairly clear if you can actuate the valve or not. Best to turn the boiler electricity off at the fuse in case the housing cover falls off (they do sometimes) and you stick your fingers accidently into something live... HTH Tim |
#5
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Central heating won't turn off!
In message , Roger Mills
writes In an earlier contribution to this discussion, Mike Lane wrote: My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks The most likely diagnosis is that you have a zone valve which is either stuck open - even when turned off at the programmer - or the micro-switch, which provides its auxilliary contacts, has failed shut. [I am assuming that you have an S-Plan system, with separate 2-port valves for HW and CH rather than a Y-Plan system with a single 3-port valve?] Someone else reported a similar problem recently which turned out to be a failed pump over-run stat on the boiler. I have to admit that I'm struggling to understand how this would make the boiler fire - rather than just running the pump continuously - but it's nevertheless something else to check. Possibly that's what the OP (Caps lock stuck) meant he could just hear something asking a noise ISTR he gave no indication as to what the boiler was, making it difficult to know much more (e.g. it's a well known problem with the baxi solo 2 pcb) -- geoff |
#6
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Central heating won't turn off!
"raden" wrote in message
... In message , Roger Mills writes In an earlier contribution to this discussion, Mike Lane wrote: My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks The most likely diagnosis is that you have a zone valve which is either stuck open - even when turned off at the programmer - or the micro-switch, which provides its auxilliary contacts, has failed shut. [I am assuming that you have an S-Plan system, with separate 2-port valves for HW and CH rather than a Y-Plan system with a single 3-port valve?] Someone else reported a similar problem recently which turned out to be a failed pump over-run stat on the boiler. I have to admit that I'm struggling to understand how this would make the boiler fire - rather than just running the pump continuously - but it's nevertheless something else to check. Possibly that's what the OP (Caps lock stuck) meant he could just hear something asking a noise ISTR he gave no indication as to what the boiler was, making it difficult to know much more (e.g. it's a well known problem with the baxi solo 2 pcb) -- geoff Hi Seems like the problem is a stiff Honeywell motorised valve on the heating side. I took the cover off and forced down the mechanism. Now, the pump has stopped and I get the resistance on the lever at the top. However, I think that when the water comes on, the pump might reactivate again. But at least, I can leave the programmer powered up without the pump coming on automatically. Is there a way of lubricating the valve or do I need to replace it? Thanks to all of you who took the trouble to respond to my original post. Mike |
#7
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Central heating won't turn off!
In an earlier contribution to this discussion,
Mike Lane wrote: Hi Seems like the problem is a stiff Honeywell motorised valve on the heating side. I took the cover off and forced down the mechanism. Now, the pump has stopped and I get the resistance on the lever at the top. However, I think that when the water comes on, the pump might reactivate again. But at least, I can leave the programmer powered up without the pump coming on automatically. Is there a way of lubricating the valve or do I need to replace it? Thanks to all of you who took the trouble to respond to my original post. Mike Not sure you can lubricate them, as such. But you can sometimes free them up by turning them backwards and forwards a few times. With any luck you should be able to remove the actuator from the 'wet' part of the valve, allowing you to get at the shaft which is normally rotated by the actuator. You should be able to turn the shaft by gripping it with fingers and thumb or, at worst, by using only light pressure with pliers. Try working it a bit to get it moving freely. If you can't, you'll have to replace it. Remember that, when motor current is removed, there is only a spring return to close the valve. If the valve is too stiff for the spring to move, it will remain open - with the symptoms which you have experienced. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#8
Posted to uk.d-i-y
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Central heating won't turn off!
Mike Lane wrote:
My system has started playing up. We noticed it when the weather turned warmer, and we turned the heating off. But the heating stays on regardless even if we also switch the water off at the timer (a Honeywell 7 day water and heating model). Basically, the pump continues working and the boiler fires up. The only way I can get things to stop is to turn the timer off at the mains. I have disconnected the frost stat to no avail, so that can't be the problem. Any help would be appreciated. Thanks Motorised valve jammed. |
#9
Posted to uk.d-i-y
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Central heating won't turn off!
Roger Mills wrote:
If the valve is too stiff for the spring to move, it will remain open - with the symptoms which you have experienced. That was my problem..gearbox went strange and the spring couldn't close it. New motor and box fixed it. |
#10
Posted to uk.d-i-y
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Central heating won't turn off!
In an earlier contribution to this discussion,
The Natural Philosopher wrote: Roger Mills wrote: If the valve is too stiff for the spring to move, it will remain open - with the symptoms which you have experienced. That was my problem..gearbox went strange and the spring couldn't close it. New motor and box fixed it. That's another possibility. What I was actually referring to was the mechanical (wet) part of the valve being too stiff for the spring in the actuator to move it. -- Cheers, Roger ______ Email address maintained for newsgroup use only, and not regularly monitored.. Messages sent to it may not be read for several weeks. PLEASE REPLY TO NEWSGROUP! |
#11
Posted to uk.d-i-y
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Central heating won't turn off!
In message , Roger Mills
writes In an earlier contribution to this discussion, The Natural Philosopher wrote: Roger Mills wrote: If the valve is too stiff for the spring to move, it will remain open - with the symptoms which you have experienced. That was my problem..gearbox went strange and the spring couldn't close it. New motor and box fixed it. That's another possibility. What I was actually referring to was the mechanical (wet) part of the valve being too stiff for the spring in the actuator to move it. As I said - yes, you can open it up, reseal and grease it, but, I think you're better off replacing it , when you take into account the work involved in doing the whole job -- geoff |
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