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My Vaillant gas water model MAG INT 19/2 Z,I want to ask if the cylindrical chamber of diaphragm which the needle open gas is filled with special oil?

As I have good water pressure but the flame don't come .

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  • Water Master
  • 2,458 Answers

No it is not

Posted on May 04, 2017

Testimonial: "so how I can make flame comes as i clean copper tube with acid and its clean now !"

  • 1 more comment 
  • paulcarew May 05, 2017

    Acid is way too strong for cleaning on that the valve comes up on water pressure pushing up on the diaphram .which pushes up on he gas valve. You may have done to damage the water section using Acid.

  • Farid Muhsen
    Farid Muhsen May 05, 2017

    Thank u Paul , I used to clean tubes with acid and water for 10 years and its going alright ,,, but this time the flame become weaker not too strong as before , any suggestion where is the problem ?? Many thanks to you !!

  • paulcarew May 06, 2017

    In the water section

×

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SOURCE: heating, but no hot water on a vaillant turbomax 28 combi

the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting

Kindly

Richie

Posted on Dec 16, 2008

mrgrzz
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SOURCE: Vaillant turbomax 28 constant hot water problem.

got your fix, its a calcium buildup in the heat exchanger, and more than likely the rest of the unit, you will need to flush the unit with about 4 gallons of vinegar, you will need to recirculate it for about 20 mins through the unit, then flush with clean water, hook it back up, it might take a couple of mins for it to run properly, but it will, I have had the same problem with Rinnai on demand hot water systems, and it worked like a charm, check the filter thats inline as well, make sure it isnt plugged, clean if needed, also if you dont have a soft water system inplace, you might want to think about buying one and having it installed, that will reduce this from happening again for alot longer period of time, hope that helps

Posted on Jan 20, 2009

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SOURCE: I can't turn the bar pressure up on my Vaillant VCW 221 Boiler

on the pipework below there may be a silver braided hose with one or two valves on the end. turn the valve(s) so the handle is inline with the pipe this will allow water from the mains supply into the heating circuit , remember to keep an eye on the pressure gauge. fill the system to 1bar cold then shut down the valve(s). turn on the boiler and it should be ok, if you lose pressure again then you may have a leak somewhere which needs to be found.

Posted on Mar 30, 2009

gary1121
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SOURCE: Vaillant Mag 325 warm water only full pres. cold low pressure

you need a certain amount of water pressure for the water heater to turn on this is actaully one of the biggest problems that all manifactures forgot to tell anyone it is normal for the computer to shut down beings it is designed to heat water at a fast rate when you turn the water down, it's not enough pressure for for sensors to turn on to heat the water so turn on the spigot a little more and enjoy

Posted on Jun 09, 2009

  • 5089 Answers

SOURCE: TF 400 Bosh water heater stops heating

More information is needed.
Is this new installation? Or old installation that has stopped working?
What is the product-type and model number?
Add a comment, and I can look up possible manual.

Posted on Apr 25, 2013

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Combi Boiler gives CH but not HW


Combi boilers have many moving parts compared to conventional models so must be serviced annually to prevent breakdowns.

Your boiler most likely has one of four problems:-

1. When the receiver for the wireless thermostat was fitted, other wiring was loosened and has come adrift. It's a possibility, but in my experience unlikely as the wiring involved isn't anything to do with HW supply..

2. During receiver fitting the pcb suffered a static electricity surge. Possible, but unlikely as this sort of damage is usually immediately evident. However, boiler pcb's are notorious for sudden failures anyway and can happen anytime. Combi pcb's are more prone to fail as they usually have up to four solenoids fitted and these do eventually fail due to mechanical wear.

3. When you your combi is in CH mode it heats the primary water circuit and directs the flow through the CH heat exchanger. When you open a hot tap (US=faucet) you're opening a supply of cold water initially as there is no stored hot water like in a conventional system. As the water starts to flow through the combi's diverter valve there's a pressure drop which activates a rubber diaphragm with mechanical connections to other parts. The diaphragm is one part which is routinely replaced annually as it will eventually fatigue and fail with the symptoms which you describe. In addition, the mechanical parts connected to the diaphragm pass through various seals in order to activate at least one micro switch. If the seals fail then the moving parts eventually corrode and seize up. Regular servicing prevents this. Combi seizures are a very common complaint in hard water areas.

4. One of the micro switches activated by the diverter valve has failed. Possible, but not likely. The purpose of the switches is usually to fire up the boiler to provide HW when the CH is not currently running, but as you haven't said which Vaillant you have I can't be definitive on this.

One major problem with combi boilers is that multiple failures can and certainly do occur almost at once. Unmaintained units may appear to be correctly functioning but in reality a number of worn parts can be close to failing. When one part fails, the others can't cope with the stress and fail as well.

In most civilised countries including the UK it's a criminal offence to attempt most repairs yourself unless you're qualified to work on gas appliances, so you need to find a decent heating engineer to service your boiler (ask your new neighbours). In the UK you can expect to pay around £120-£150 annually for a routine boiler service. If the circuit board has failed then it can easily add over £100. If parts inside the diverter valve/manifold have seized then you can be looking at an additional £80-£150. Note that diaphragm failures on their own do not merit diverter/manifold replacement and that if you have a new diverter fitted then a new diaphragm will already be present inside.

Dishonest heating engineers always diagnose a failed pcb as they know that you have no way of knowing whether it's true. If you can live with the problem for a few days then failed pcb's are usually a straightforward repair and there are plenty of companies who will send you a guaranteed exchange unit for much less than the cost of a new one. As long as you are not opening the main boiler casing which houses the combustion chamber and gas valve assemblies then some territories allow non gas qualified replacement, but others insist that the work is done by a qualified electrician: this is not the case in the UK as long as the pcb is not connected directly to mains electricity (no modern domestic ones are).

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Vaillant combi boiler,dirty water comes out of hot and cold taps ,just been serviced by british gas,could you tell me the problem


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Can you please tell me the model of the vaillant, and the approx age?

I can solve this problem

I await your reply

Thanks

Steve :)

Jul 16, 2009 | Water Heaters

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I can't turn the bar pressure up on my Vaillant VCW 221 Boiler


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Mar 25, 2009 | Water Heaters

1 Answer

Vaillant turbomax 28 constant hot water problem.


got your fix, its a calcium buildup in the heat exchanger, and more than likely the rest of the unit, you will need to flush the unit with about 4 gallons of vinegar, you will need to recirculate it for about 20 mins through the unit, then flush with clean water, hook it back up, it might take a couple of mins for it to run properly, but it will, I have had the same problem with Rinnai on demand hot water systems, and it worked like a charm, check the filter thats inline as well, make sure it isnt plugged, clean if needed, also if you dont have a soft water system inplace, you might want to think about buying one and having it installed, that will reduce this from happening again for alot longer period of time, hope that helps

Jan 20, 2009 | Water Heaters

1 Answer

Heating, but no hot water on a vaillant turbomax 28 combi


the problem is the diverter valve unit, source a corgi engineer to fit new one, cost for valve approx 80 quid +fitting

Kindly

Richie

Dec 15, 2008 | Water Heaters

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