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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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problem with a combi boiler
I've just moved into a new house, and it has a combi boiler. The central
heating from it works fine both upstairs and downstairs - all the radiators heat up. The problem is with the hot water. The hot water tap in the kitchen next to the boiler works fine, but there is no hot water in the bathroom upstairs. The radiator in the bathroom (and other upstairs rooms) work fine, but no hot water comes out of either the shower, or the bathroom sink. Can anyone give me a few pointers on what the problem might be, where to start looking, etc. It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. -- Alastair Rainsbury "CTID" ) If you must choose between two evils, pick the one you've never tried before. http://www.ignis-fatuus.org |
#2
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problem with a combi boiler
Alastair Rainsbury wrote:
I've just moved into a new house, and it has a combi boiler. The central heating from it works fine both upstairs and downstairs - all the radiators heat up. The problem is with the hot water. The hot water tap in the kitchen next to the boiler works fine, but there is no hot water in the bathroom upstairs. The radiator in the bathroom (and other upstairs rooms) work fine, but no hot water comes out of either the shower, or the bathroom sink. Can anyone give me a few pointers on what the problem might be, where to start looking, etc. It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. If you mean no water comes out at all, have you checked for a closed stopcock? If however, you get cold water out of the taps, have you checked there is no hot water cylinder or thermal store installed? ... Lee -- To reply use lee.blaver and ntlworld.com |
#3
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problem with a combi boiler
Alastair Rainsbury wrote:
It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. Alastair, Can you hear water flowing through the combi when the upstairs taps run? This is just a basic sanity check to ensure they are actually plumbed in as you'd expect. If they are, then I'd suspect that the flow control valve on the boiler is set too low. You need to check the manual to know precisely, but on the combi I used to have, it was on the cold inlet to the boiler, and needed just a flat-bladed screwdriver to adjust. The commissioning guide to combis usually advises adjusting this valve so that turning on a tap to maximum will provide very hot water. However, if the mains pressure changes, this setting can be wrong. I used to just open the flow valve fully, knowing that if I turned on the tap too much, the water would actually be cooler than if the tap were on less. All of this assumes that your combi is supplied with cold water from the mains. If it is supplied from a cold tank in the loft, then you might not have enough head to trigger the flow switch. Also, even with the mains I suppose the pressure could simply be too upstairs? Ewan |
#4
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problem with a combi boiler
In article , Ewan MacIntyre
writes Alastair Rainsbury wrote: It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. Alastair, Can you hear water flowing through the combi when the upstairs taps run? This is just a basic sanity check to ensure they are actually plumbed in as you'd expect. If they are, then I'd suspect that the flow control valve on the boiler is set too low. You need to check the manual to know precisely, but on the combi I used to have, it was on the cold inlet to the boiler, and needed just a flat-bladed screwdriver to adjust. The commissioning guide to combis usually advises adjusting this valve so that turning on a tap to maximum will provide very hot water. However, if the mains pressure changes, this setting can be wrong. I used to just open the flow valve fully, knowing that if I turned on the tap too much, the water would actually be cooler than if the tap were on less. All of this assumes that your combi is supplied with cold water from the mains. If it is supplied from a cold tank in the loft, then you might not have enough head to trigger the flow switch. Also, even with the mains I suppose the pressure could simply be too upstairs? Ewan Do you have a hot tank ?. If you *do* then it will be treated as a 'heating zone', in which case only the kitchen sink may be on the DHW circuit. If this is the case a 2-way or 3-way valve is stuck preventing the hot tank primary coil from getting any hot water even though the rads (on another heating zone) are working fine. -- Andrew |
#5
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problem with a combi boiler
In message , Ewan MacIntyre
writes Alastair Rainsbury wrote: It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. Alastair, Can you hear water flowing through the combi when the upstairs taps run? This is just a basic sanity check to ensure they are actually plumbed in as you'd expect. If they are, then I'd suspect that the flow control valve on the boiler is set too low. You need to check the manual to know precisely, but on the combi I used to have, it was on the cold inlet to the boiler, and needed just a flat-bladed screwdriver to adjust. The commissioning guide to combis usually advises adjusting this valve so that turning on a tap to maximum will provide very hot water. However, if the mains pressure changes, this setting can be wrong. I used to just open the flow valve fully, knowing that if I turned on the tap too much, the water would actually be cooler than if the tap were on less. All of this assumes that your combi is supplied with cold water from the mains. If it is supplied from a cold tank in the loft, then you might not have enough head to trigger the flow switch. Also, even with the mains I suppose the pressure could simply be too upstairs? Ewan Hmmm, that sounds like the best bet so far. I'm now off to start twiddling knobs/valves. -- Alastair Rainsbury "CTID" ) Amazingly, it is illegal in all 48 US states for a railway train to be equipped with brakes. http://www.ignis-fatuus.org |
#6
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problem with a combi boiler
"Alastair Rainsbury" wrote in message ... I've just moved into a new house, and it has a combi boiler. The central heating from it works fine both upstairs and downstairs - all the radiators heat up. The problem is with the hot water. The hot water tap in the kitchen next to the boiler works fine, but there is no hot water in the bathroom upstairs. The radiator in the bathroom (and other upstairs rooms) work fine, but no hot water comes out of either the shower, or the bathroom sink. Can anyone give me a few pointers on what the problem might be, where to start looking, etc. It seems weird that it's only the ho****er upstairs that's not working - if it was all the hot water, or if everything upstairs (i.e. radiators included) that didn't work it would make more sense to me. Alastair Rainsbury "CTID" ) If all the hot water is produced by the boiler, then it might be that the pipe run (length) is to much for the boiler and you're losing all the heat from the pipes before it reaches the taps upstairs. You might also have a cylinder that stores hot water produced from the heating circuit of the boiler, so check that valves are fully open, and that the heating circuit doesn't have a zone valve (electrically operated valve) fitted to the system and is stopping the hot water cylinder from heating. --- http://www.basecuritysystems.no-ip.com Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.557 / Virus Database: 349 - Release Date: 30/12/03 |
#7
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problem with a combi boiler
and that the heating circuit doesn't have a zone valve (electrically
operated valve) fitted to the system and is stopping the hot water cylinder from heating. Of course, the previous occupant may have turned off the hot water at the programmer when they moved out. Christian. |
#8
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problem with a combi boiler
In message , Christian
McArdle writes and that the heating circuit doesn't have a zone valve (electrically operated valve) fitted to the system and is stopping the hot water cylinder from heating. Of course, the previous occupant may have turned off the hot water at the programmer when they moved out. Christian. I've checked that already, the switch points to hot water & central heating -- Alastair Rainsbury "CTID" ) Amazingly, it is illegal in all 48 US states for a railway train to be equipped with brakes. http://www.ignis-fatuus.org |
#9
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US train brakes (was problem with a combi boiler
"Alastair Rainsbury" wrote in message
... Alastair Rainsbury "CTID" ) Amazingly, it is illegal in all 48 US states for a railway train to be equipped with brakes. http://www.ignis-fatuus.org go on - tell us! (The site crashes my IE (5.5, sp2)) -- John Stumbles -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-|-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ -+ Copyright (c) Sirius Cybernetics Corporation (formerly Microsoft) |
#10
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problem with a combi boiler
Alastair Rainsbury wrote:
Alastair Rainsbury "CTID" ) Amazingly, it is illegal in all 48 US states for a railway train to be equipped with brakes. http://www.ignis-fatuus.org I haven't looked at the above site, but if it can't even get the number of US states correct, why should the rest be believed? (There are 50 states, since, IIRC, the 60s.) |
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