Vaillant TURBOmax Plus boiler: hot water problem
 

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water,
the boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch.
Some additional info that may or may not be relevant: i) the problem
occurs most frequently in cold weather, ii) the boiler is mounted in
an unheated part of the house and iii) the boiler is about 8 years
old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

Vaillant TURBOmax Plus boiler: hot water problem
 

Jim Walsh wrote:
I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water,
the boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch.
Some additional info that may or may not be relevant: i) the problem
occurs most frequently in cold weather, ii) the boiler is mounted in
an unheated part of the house and iii) the boiler is about 8 years
old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

Interestingly, I had the same intermittent symptoms with my GloWorm
Micron of about the same vintage, although it affected all hot water
temperatures being a vented non-condensing boiler system.

Not being confident of doing a technical diagnosis competently myself, I
called in a local heating engineer (I know, it's not DIY!) who tried to
guess what was wrong and proceeded to replace parts in the hope that the
problem would solve itself. I had to knock that cavalier and expensive
approach on the head quickly.

I then called in British Gas for a fixed repair fee. They replaced the
PCB and re-adjusted the misconfigured gas valve pressures left by the
previous "engineer" but that didn't solve the problem. It ended up
costing them a lot more than the fee I paid, but they did solve it
eventually.

On the last but one visit, the fitter was accompanied by a supervisor
who eventually suggested that they try measuring the resistance of the
thermistor (water temperature sensor) and discovered that it was way out
of specification (2Mohms instead of a couple of Kohms). They fitted a
new thermistor on the last visit and that solved the problem. It must
be said, however, that the old PCB was in a poor condition with brown
marks (overheating or blown capacitor) so that might have contributed to
the problem as well.

The obvious first point, for those with multi-meters and access to
*full* technical specifications, is to check the system carefully for
actual errors to diagnose the problem *before* fitting any new parts.

The second point is that British Gas are nowhere near as bad as they are
sometimes painted; they do keep trying until they find the answer and
their fixed fee repair scheme can be good value for money, especially if
you have an unusual problem. I would be happy to use them again (I do
not have shares in British Gas).

--
Dave N

Vaillant TURBOmax Plus boiler: hot water problem
 

On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water, the
boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch. Some additional
info that may or may not be relevant: i) the problem occurs most
frequently in cold weather, ii) the boiler is mounted in an unheated
part of the house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow of HW
at times then this problem is absolutely the diverter valve.
The reset cause the system to recalibrate the motion of the diverter valve
thus giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).


--
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

Vaillant TURBOmax Plus boiler: hot water problem
 

In article , Ed Sirett
writes
On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water, the
boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch. Some additional
info that may or may not be relevant: i) the problem occurs most
frequently in cold weather, ii) the boiler is mounted in an unheated
part of the house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow of HW
at times then this problem is absolutely the diverter valve.
The reset cause the system to recalibrate the motion of the diverter valve
thus giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).


We have one of these in the Scout Hut which appears to have a partially
stuck pressure relief valve - drips and the pressure drops, then it is
OK for several days, then drips...

I once found the maintenance and installation manuals on line but can't
find them anymore - anyone point me at a site??

Thanks

--
John Alexander,

Remove NOSPAM if replying by e-mail

Vaillant TURBOmax Plus boiler: hot water problem
 

On 5 Dec, 21:13, John wrote:
In article , Ed Sirett
writes

On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water, the
boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch. Some additional
info that may or may not be relevant: i) the problem occurs most
frequently in cold weather, ii) the boiler is mounted in an unheated
part of the house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow of HW
at times then this problem is absolutely the diverter valve.
The reset cause the system to recalibrate the motion of the diverter valve
thus giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).

We have one of these in the Scout Hut which appears to have a partially
stuck pressure relief valve - drips and the pressure drops, then it is
OK for several days, then drips...

I once found the maintenance and installation manuals on line but can't
find them anymore - anyone point me at a site??

Thanks

--
John Alexander,

Remove NOSPAM if replying by e-mail

You might find it he
http://www.manualsnguides.com/result...ateriel=Boiler

Vaillant TURBOmax Plus boiler: hot water problem
 

On 5 Dec, 22:04, wrote:
On 5 Dec, 21:13, John wrote:



In article , Ed Sirett
writes

On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water, the
boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch. Some additional
info that may or may not be relevant: i) the problem occurs most
frequently in cold weather, ii) the boiler is mounted in an unheated
part of the house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow of HW
at times then this problem is absolutely the diverter valve.
The reset cause the system to recalibrate the motion of the diverter valve
thus giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).

We have one of these in the Scout Hut which appears to have a partially
stuck pressure relief valve - drips and the pressure drops, then it is
OK for several days, then drips...

I once found the maintenance and installation manuals on line but can't
find them anymore - anyone point me at a site??

Thanks

--
John Alexander,

Remove NOSPAM if replying by e-mail

You might find it hehttp://www.manualsnguides.com/result...LLANT&materiel...

Ooops! You have to buy them.

Vaillant TURBOmax Plus boiler: hot water problem
 

On Fri, 05 Dec 2008 21:13:17 +0000, John wrote:

In article , Ed Sirett
writes
On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing an
intermittant problem with the supply of hot water from it. The central
heating function works just fine, but upon trying to draw hot water,
the boiler frequently supplies only lukewarm water. When the fault
manifests, adjusting the hot water temperature control on the boiler
makes no difference. The only thing I have found that seems to get it
working properly again (although not always at the first attempt) is
turning the boiler off and on again at the main switch. Some
additional info that may or may not be relevant: i) the problem occurs
most frequently in cold weather, ii) the boiler is mounted in an
unheated part of the house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow of HW
at times then this problem is absolutely the diverter valve. The reset
cause the system to recalibrate the motion of the diverter valve thus
giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).


We have one of these in the Scout Hut which appears to have a partially
stuck pressure relief valve - drips and the pressure drops, then it is
OK for several days, then drips...


Expansion vessel? See Sealed CH FAQ.


I once found the maintenance and installation manuals on line but can't
find them anymore - anyone point me at a site??


Is it time to seed the Gas Appliance Manuals? About 1300Mb of Manuals for
a lot of gas appliances?





--
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

Vaillant TURBOmax Plus boiler: hot water problem
 

On Fri, 05 Dec 2008 14:05:49 -0800, dawoodseed wrote:

On 5 Dec, 22:04, wrote:
On 5 Dec, 21:13, John wrote:



In article , Ed Sirett
writes

On Fri, 05 Dec 2008 00:33:42 -0800, Jim Walsh wrote:

I have a Vaillant TURBOmax plus combi boiler and I am experiencing
an intermittant problem with the supply of hot water from it. The
central heating function works just fine, but upon trying to draw
hot water, the boiler frequently supplies only lukewarm water.
When the fault manifests, adjusting the hot water temperature
control on the boiler makes no difference. The only thing I have
found that seems to get it working properly again (although not
always at the first attempt) is turning the boiler off and on
again at the main switch. Some additional info that may or may not
be relevant: i) the problem occurs most frequently in cold
weather, ii) the boiler is mounted in an unheated part of the
house and iii) the boiler is about 8 years old.

Any help/suggestions gratefully received.

Thanks in advance, Jim.

I'd suggest from experience that if you can get an acceptable flow
of HW at times then this problem is absolutely the diverter valve.
The reset cause the system to recalibrate the motion of the diverter
valve thus giving a temporary releif to the symptoms.

To fix this fault you will need a new diverter valve (c. £100).

We have one of these in the Scout Hut which appears to have a
partially stuck pressure relief valve - drips and the pressure drops,
then it is OK for several days, then drips...

I once found the maintenance and installation manuals on line but
can't find them anymore - anyone point me at a site??

Thanks

--
John Alexander,

Remove NOSPAM if replying by e-mail

You might find it
hehttp://www.manualsnguides.com/results_mm.php?
marque=VAILLANT&materiel...

Ooops! You have to buy them.

Or find this file on the Pirate Bay...

GAM.3814785.TPB.torrent

That's several hundred manuals in 1.05 Gb

--
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