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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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Vaillant Combi boiler hot water problems
My Vaillant Turbomax Plus boiler is having problems supplying hot water.
The central heating is fine but the hot water,though it works,intermittently goes cold. I first noticed it when using the shower, I thought at first that the shower was at fault, however on checking it also happens when running the hot taps. I have checked that no one else is calling for hot water at the same time and have tried adjusting the water temperature to no avail. At a guess it runs hot ok for about 20 seconds then goes cold for 10 seconds. Any ideas please? |
#2
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Vaillant Combi boiler hot water problems
Broadback wrote:
My Vaillant Turbomax Plus boiler is having problems supplying hot water. The central heating is fine but the hot water,though it works,intermittently goes cold. I first noticed it when using the shower, I thought at first that the shower was at fault, however on checking it also happens when running the hot taps. I have checked that no one else is calling for hot water at the same time and have tried adjusting the water temperature to no avail. At a guess it runs hot ok for about 20 seconds then goes cold for 10 seconds. Any ideas please? Does it continually go hot then cold then hot etc? If so, possible hot water heat exchanger blockage - quite common apparently.. Or, Primary heat exchanger fault, or possible pump failing - both less likely, but possible.. Or does it run hot for 20 seconds, the stays luke warm? That would point toward a divertor valve fault. Alan. -- To reply by e-mail, change the ' + ' to 'plus'. |
#3
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Vaillant Combi boiler hot water problems
A.Lee wrote:
Broadback wrote: My Vaillant Turbomax Plus boiler is having problems supplying hot water. The central heating is fine but the hot water,though it works,intermittently goes cold. I first noticed it when using the shower, I thought at first that the shower was at fault, however on checking it also happens when running the hot taps. I have checked that no one else is calling for hot water at the same time and have tried adjusting the water temperature to no avail. At a guess it runs hot ok for about 20 seconds then goes cold for 10 seconds. Any ideas please? Does it continually go hot then cold then hot etc? If so, possible hot water heat exchanger blockage - quite common apparently.. Or, Primary heat exchanger fault, or possible pump failing - both less likely, but possible.. Or does it run hot for 20 seconds, the stays luke warm? That would point toward a divertor valve fault. Alan. It alternates hot and cold. |
#4
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Vaillant Combi boiler hot water problems
Broadback wrote:
A.Lee wrote: Broadback wrote: My Vaillant Turbomax Plus boiler is having problems supplying hot water. The central heating is fine .... Does it continually go hot then cold then hot etc? If so, possible hot water heat exchanger blockage - quite common apparently.. It alternates hot and cold. I had the same thing, starting around this time last year. DHW Heat Exchanger was cleaned out, then changed after a few months, still no good, turned out to be either the primary heat exchanger or the pump. Power flushing and chemical treatment did not cure the fault. It was 10 years old, had never been very reliable, so I bit the bullet and had a new boiler. It is possible that a flush out of the DHW HE would cure your fault. On mine, it took 10 minutes or so to get the HE out, so a fairly easy task, no idea what it would be like on your Valiant. Alan. -- To reply by e-mail, change the ' + ' to 'plus'. |
#5
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Vaillant Combi boiler hot water problems
On Mon, 16 Feb 2009 18:14:50 +0000, Broadback wrote:
A.Lee wrote: Broadback wrote: My Vaillant Turbomax Plus boiler is having problems supplying hot water. The central heating is fine but the hot water,though it works,intermittently goes cold. I first noticed it when using the shower, I thought at first that the shower was at fault, however on checking it also happens when running the hot taps. I have checked that no one else is calling for hot water at the same time and have tried adjusting the water temperature to no avail. At a guess it runs hot ok for about 20 seconds then goes cold for 10 seconds. Any ideas please? Does it continually go hot then cold then hot etc? If so, possible hot water heat exchanger blockage - quite common apparently.. Or, Primary heat exchanger fault, or possible pump failing - both less likely, but possible.. Or does it run hot for 20 seconds, the stays luke warm? That would point toward a divertor valve fault. Alan. It alternates hot and cold. One or both sides of the 2ndary heatX. Either Replace with a new unit and then descale "the spare" at your leisure. Or. If you can do without heating and HW for a day then descale the existing unit. You will not get good results trying to descale either side in situ. You may, if very unlucky spring a leak between the primary and domestic sides when you descale. -- Ed Sirett - Property maintainer and registered gas fitter. The FAQ for uk.diy is at http://www.diyfaq.org.uk Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html |
#6
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Vaillant Combi boiler hot water problems
In message , A.Lee
writes Broadback wrote: My Vaillant Turbomax Plus boiler is having problems supplying hot water. The central heating is fine but the hot water,though it works,intermittently goes cold. I first noticed it when using the shower, I thought at first that the shower was at fault, however on checking it also happens when running the hot taps. I have checked that no one else is calling for hot water at the same time and have tried adjusting the water temperature to no avail. At a guess it runs hot ok for about 20 seconds then goes cold for 10 seconds. Any ideas please? Does it continually go hot then cold then hot etc? If so, possible hot water heat exchanger blockage - quite common apparently.. possibly, but then the flow rate would drop Or, Primary heat exchanger fault, or possible pump failing - both less likely, but possible.. possibly, but it would also present itself in the CH mode too Or does it run hot for 20 seconds, the stays luke warm? That would point toward a divertor valve fault. I can't remember, but, if it opens the gas valve and then has a certain time window for flame sensing to occur, and its not, that would account for the behaviour he's seeing Alan. -- geoff |
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