Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

Over the past couple of days our valliant boiler has developed a
strange problem.

I'm not quite sure I understand the type of system you have. Could you
answer the following:

1. What sort of hot water system do you have? (i.e. hot water cylinder/combi
boiler)

2. Is the primary circulating water sealed and pressurised, or gravity fed?
(you mention an overflow pipe, which suggests a feed/expansion tank and a
filling loop, which suggests sealed operation).

3. What is the model of your boiler?

Christian.

"Christian McArdle" wrote in message et...
Over the past couple of days our valliant boiler has developed a
strange problem.

I'm not quite sure I understand the type of system you have. Could you
answer the following:

1. What sort of hot water system do you have? (i.e. hot water cylinder/combi
boiler)

2. Is the primary circulating water sealed and pressurised, or gravity fed?
(you mention an overflow pipe, which suggests a feed/expansion tank and a
filling loop, which suggests sealed operation).

3. What is the model of your boiler?

Christian.

Its a Valliant combi boiler turbomax 282

Mayur wrote:

Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

I'm guessing you have a VCW?
I would greatly suspect that your new filling loop is continuously
topping the primary circuit.
The diverter valve is having problems but when the primary pressure is
brought under control things may get better?

ACTION:
1) Fix the inlet loop problem.
2) Add corrosion inhibitor to the circuit ASAP.
3) Get the air out.
4) Check for correct operation of the diverter valve. Replace as
necessay.

How long since this boiler was properly [1] serviced?


[1] I don't mean sniffed at by BG with a combustion analyser.
--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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

"Mayur" wrote in message
om...
Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

How about the pressure vessel - if the diaphram splits and you top it up you
can get very high pressures.
I had exactly that with a Worcester a few months back.
Incidentally, it doesnt take long to screw the overflow valve up when the
system goes over pressure.

Steve

Ed Sirett wrote in message ...
Mayur wrote:

Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

I'm guessing you have a VCW?
I would greatly suspect that your new filling loop is continuously
topping the primary circuit.
The diverter valve is having problems but when the primary pressure is
brought under control things may get better?

ACTION:
1) Fix the inlet loop problem.
2) Add corrosion inhibitor to the circuit ASAP.
3) Get the air out.
4) Check for correct operation of the diverter valve. Replace as
necessay.

How long since this boiler was properly [1] serviced?


[1] I don't mean sniffed at by BG with a combustion analyser.

I'm a bit confused now, let me clarify a few things

On Sunday
the reason I changed the filler loop is because I thought the valve
had stopped working properly. On Sunday the handle on the vavle
snapped off and then when I used a set of pliers to turn it, it just
wouldn't open or close. I thought it was stuck in the close position
so I left it but come Monday morning it started topping up ? I'd
suspected that some how the valve had become open and started the
topping up process.

Monday evening I changed the filler loop. On inspection, the filler
loop looked valve was ok ? using pliers open and closed the valve ?

Tuesday morning same problem !

It did it Weds morning but this morning it was fine.
Inhibitor was added to the system around the same time last year and
all the air from the rads has been removed.
What is a VCW ?

Thanks

Monday evening I changed the filler loop. On inspection, the filler
loop looked valve was ok ? using pliers open and closed the valve ?

The filling loop should include a flexible hose, which should not be left
connected. That way you can be sure there are no leaks. OTOH, some bungled
installations just use fixed pipework.

What is a VCW ?

A VCW is an Vaillant boiler that was common a few years back.

Christian.

"sro" wrote in message ...
"Mayur" wrote in message
om...
Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

How about the pressure vessel - if the diaphram splits and you top it up you
can get very high pressures.
I had exactly that with a Worcester a few months back.
Incidentally, it doesnt take long to screw the overflow valve up when the
system goes over pressure.

Steve

Sorry folks but that should read Vaillant turbomax 828

Mayur wrote:

Ed Sirett wrote in message ...
Mayur wrote:

Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

I'm guessing you have a VCW?
I would greatly suspect that your new filling loop is continuously
topping the primary circuit.
The diverter valve is having problems but when the primary pressure is
brought under control things may get better?

ACTION:
1) Fix the inlet loop problem.
2) Add corrosion inhibitor to the circuit ASAP.
3) Get the air out.
4) Check for correct operation of the diverter valve. Replace as
necessay.

How long since this boiler was properly [1] serviced?


[1] I don't mean sniffed at by BG with a combustion analyser.

I'm a bit confused now, let me clarify a few things

On Sunday
the reason I changed the filler loop is because I thought the valve
had stopped working properly. On Sunday the handle on the vavle
snapped off and then when I used a set of pliers to turn it, it just
wouldn't open or close. I thought it was stuck in the close position
so I left it but come Monday morning it started topping up ? I'd
suspected that some how the valve had become open and started the
topping up process.

Monday evening I changed the filler loop. On inspection, the filler
loop looked valve was ok ? using pliers open and closed the valve ?

Tuesday morning same problem !

It did it Weds morning but this morning it was fine.
Inhibitor was added to the system around the same time last year and
all the air from the rads has been removed.
What is a VCW ?

A particular model of Vaillant combi which has (IME) a tendancy to run
the CH on its own accord.
Fixable with a new PCB.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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

Mayur wrote:

"sro" wrote in message ...
"Mayur" wrote in message
om...
Over the past couple of days our valliant boiler has developed a
strange problem. When the ch comes on in the morning and the hw is
being used at the same time, some how water is getting into the ch
system and the pressure in the ch system goes upto about 4 bar and
then starts overflowing via the over flow pipe, at the same time the
boiler is making a funny noise.
What we have been doing when this has been happening is reducing the
pressure by opening the ch drain valve and once we have done this,
then its OK and continues to work.
We have had problems in the past with the boiler, its started off when
the pilot light kept going out and that sorted itself out, then its
was the rads getting hot when the ch system was off ? the only part we
have changed since having the boiler is the diaphram. I changed the
filler loop just the other day but that didn't help, could this be the
diverter valve ?

How about the pressure vessel - if the diaphram splits and you top it up you
can get very high pressures.
I had exactly that with a Worcester a few months back.
Incidentally, it doesnt take long to screw the overflow valve up when the
system goes over pressure.

Steve

Sorry folks but that should read Vaillant turbomax 828

IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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

Ed Sirett wrote:


Sorry folks but that should read Vaillant turbomax 828


IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee

--
Never summon Anything you can't banish.
-
To reply use lee.blaver and ntlworld com

Lee Blaver wrote in message ...
Ed Sirett wrote:


Sorry folks but that should read Vaillant turbomax 828


IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee

The boiler itself is about 5 yrs old. I'm pretty sure it has
electronic ingition but how do you tell ? If this system has a
built-in filling loop, where is it located ? as the only I know and
use is external and connected between the mains and one of the ch
system pipes. Also, regarding the pressure vessel, I know that they
are usually red in colour and round but looking inside the Vaillant I
don't see one ? any pointers ?

Mayur wrote:


Sorry folks but that should read Vaillant turbomax 828



It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee


The boiler itself is about 5 yrs old. I'm pretty sure it has
electronic ingition but how do you tell ? If this system has a
built-in filling loop, where is it located ? as the only I know and
use is external and connected between the mains and one of the ch
system pipes. Also, regarding the pressure vessel, I know that they
are usually red in colour and round but looking inside the Vaillant I
don't see one ? any pointers ?

Unless yours is a different model from our 828 Turbomax, then it's an
8mm or so braided hose that is joined to the incoming mains water block.
There is a screwdriver slot in the water block to operate the filling loop.

Again, on ours the pressure vessel is red and sits at the very back of
the boiler, against the wall. You can't miss it...
It has a car-type valve on the top, so you can check the pressure.

Lee
--
Never summon Anything you can't banish.
-
To reply use lee.blaver and ntlworld com

Lee Blaver wrote:

Ed Sirett wrote:


Sorry folks but that should read Vaillant turbomax 828


IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


It also has a built-in filling loop, have you checked this one isn't
"open" ?

Earlier models had just one filling valve but later models have two
which both need to be operated to allow water in.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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

Mayur wrote:

Lee Blaver wrote in message ...
Ed Sirett wrote:


Sorry folks but that should read Vaillant turbomax 828


IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee

The boiler itself is about 5 yrs old. I'm pretty sure it has
electronic ingition but how do you tell ?

It has. Also it does not have a push button sparker for lighting the
pilot.


If this system has a
built-in filling loop, where is it located ? as the only I know and
use is external and connected between the mains and one of the ch
system pipes.

Is this a boiler with a digital numeric display or with a ladder of
Leds?

If its the former it is a turbomax+ which IIRc started around 2000.
I suspect it is the plain turbomax. These have external filling loops.



Also, regarding the pressure vessel, I know that they
are usually red in colour and round but looking inside the Vaillant I
don't see one ? any pointers ?
It's big round and red/brown but it is also hidden right at the back
behind the combustion chamber.

You might find the dry side valve if you look down from above at the
back.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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

Lee Blaver wrote in message ...
Mayur wrote:


Sorry folks but that should read Vaillant turbomax 828



It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee


The boiler itself is about 5 yrs old. I'm pretty sure it has
electronic ingition but how do you tell ? If this system has a
built-in filling loop, where is it located ? as the only I know and
use is external and connected between the mains and one of the ch
system pipes. Also, regarding the pressure vessel, I know that they
are usually red in colour and round but looking inside the Vaillant I
don't see one ? any pointers ?

Unless yours is a different model from our 828 Turbomax, then it's an
8mm or so braided hose that is joined to the incoming mains water block.
There is a screwdriver slot in the water block to operate the filling loop.

Again, on ours the pressure vessel is red and sits at the very back of
the boiler, against the wall. You can't miss it...
It has a car-type valve on the top, so you can check the pressure.

Lee

Just looking at the servicing manual, I can confirm that the boiler is
a turbomax VUW 282/1E

Ed Sirett wrote:

Mayur wrote:

Lee Blaver wrote in message ...

Ed Sirett wrote:

Sorry folks but that should read Vaillant turbomax 828


IIRC the pilot is electric ignition? It's quite a new model.
Check out all the SealedCH FAQ then sort the other problems.


It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee

The boiler itself is about 5 yrs old.

snip


Is this a boiler with a digital numeric display or with a ladder of
Leds?

If its the former it is a turbomax+ which IIRc started around 2000.
I suspect it is the plain turbomax. These have external filling loops.


Forgot about the earlier ones, sorry to be misleading.

Lee


--
Never summon Anything you can't banish.
-
To reply use lee.blaver and ntlworld com

Mayur wrote:

Lee Blaver wrote in message ...
Mayur wrote:


Sorry folks but that should read Vaillant turbomax 828



It also has a built-in filling loop, have you checked this one isn't
"open" ?

Lee


The boiler itself is about 5 yrs old. I'm pretty sure it has
electronic ingition but how do you tell ? If this system has a
built-in filling loop, where is it located ? as the only I know and
use is external and connected between the mains and one of the ch
system pipes. Also, regarding the pressure vessel, I know that they
are usually red in colour and round but looking inside the Vaillant I
don't see one ? any pointers ?

Unless yours is a different model from our 828 Turbomax, then it's an
8mm or so braided hose that is joined to the incoming mains water block.
There is a screwdriver slot in the water block to operate the filling loop.

Again, on ours the pressure vessel is red and sits at the very back of
the boiler, against the wall. You can't miss it...
It has a car-type valve on the top, so you can check the pressure.

Lee

Just looking at the servicing manual, I can confirm that the boiler is
a turbomax VUW 282/1E

Sorry I forgot that they called some of the earlier combis 'turbomax' as
well.
It is nigh on certain that it has only an external filing loop.

The expansion vessel may be long and rectangular and to the side of the
boiler. Anyway you now have the instructions...

So back on the main job.
Check for water and pressure on the dry side valve of the expansion
vessel.
Check for a filling loop that is letting by when off.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at 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