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Vaillant 125/7 AWTZ B won't allow pilot light switch to rotate when gas supply is turned on.It rotates easily when gas pressure is removed.

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5 Suggested Answers

meBNme
  • 334 Answers

SOURCE: My fan limit switch will

Make sure nothing is bent and causing added pressure to keep it sticking.

You will likely need to replace the limit switch.

I don't know your model, but its probably 2 wires, 2 or 4 screws and runs about 20 to 40 bucks for the part.
Turn the power off first.

Posted on Dec 06, 2008

heatman101
  • 43501 Answers

SOURCE: I purchased a used Lochinvar

Hi,
If you are not getting any spark then you will need to turn the unit off completely and wait a few minutes. Then reapply the power and see if it reset its self...
If not then check that the power is correct. On some houses the neutral can be hot and the hot the nuetral. In this case many electronic ignitions will not work....this is called reverse polarity...

If that all checks out then you probably have a bad igniton control and it will have to be replaced...

Purging the lines may be neccesary... but if it is not sparking then that is not your problem at this time...

heatman101

Posted on Oct 05, 2010

espressonist
  • 1711 Answers

SOURCE: I have a gas fireplace

The gas pressure is not stable. Either gas pressure valve is problematic, or the burner orifice is dirty and the pressure out is blocked. You can try to clean the burner orifice first.

Posted on Nov 06, 2010

heatman101
  • 43501 Answers

SOURCE: I have a Vermont Castings

Hi,
From what you are showing and saying I would say that you have a bad gas valve... Your test B is the most telling in that it pulls the MV's down when you close the wall switch, but the gas valve does not open...this tells me that it is trying but the valve is not opening...

Now... the next problem will be to find that valve... from doing a very quick search, I believe that it is an OEM valve and probably will only be available from the manufacturer or a dealer...

So I would contact your dealer or Vermont castings and try to secure a new gas valve.

If it were a thermocouple problem the pilot would not stay lit...

One other test would be to bypass the wall switch and jumper the gas valve directly to make sure the wall switch is not the problem...

heatman101

Posted on Nov 07, 2010

  • 1015 Answers

SOURCE: We have an older (22

On some gas valves the pilot setting is on the same dial as pilot on and on .on others the pilot light has aseperate button on right side of control dial. If yours has this there will be a cut out on cotrol dial that must be aligned with button to allow it to be depressed to light pilot. If yours has this align control dial cutout with pilot button,depress button and light pilot,hold for about one min. and slowly release,if pilot light stays lit,turn down thermostat and rotate control dial normally to right . There should be arrows or marks on dial and gas valve to line up. If pilot light stays lit turn dial to next position and check to see that pilot is still lit. This should be on position, turn up thermostat and burner should light. If your dial has pilot light setting on it then rotate dial to each position,try to depress dial and when you have right one dial will depress allowing you to light pilot. Follow same procedure as above and you should be in business. Hope this helps.Thank you

Posted on Nov 11, 2010

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Hi,
Often times it is dirt in the pilot orifice...take the pilot apart and blow everything out with compressed air and then reassemble...

heatman101

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On some gas valves the pilot setting is on the same dial as pilot on and on .on others the pilot light has aseperate button on right side of control dial. If yours has this there will be a cut out on cotrol dial that must be aligned with button to allow it to be depressed to light pilot. If yours has this align control dial cutout with pilot button,depress button and light pilot,hold for about one min. and slowly release,if pilot light stays lit,turn down thermostat and rotate control dial normally to right . There should be arrows or marks on dial and gas valve to line up. If pilot light stays lit turn dial to next position and check to see that pilot is still lit. This should be on position, turn up thermostat and burner should light. If your dial has pilot light setting on it then rotate dial to each position,try to depress dial and when you have right one dial will depress allowing you to light pilot. Follow same procedure as above and you should be in business. Hope this helps.Thank you

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Pilot LIGHT KEEPS GOING OUT OUT


The pilot light jet may have got a little bit of dirt or grit in it which is preventing it from keeping alight. If the pilot light has only a weak flame, the whoosh of the main burner igniting can quite often blow out the pilot. Try probing the jet with a fine piece of wire to see it the blockage can be dislodged. You may have to unscrew the jet to clear it by blowing air through it. Make sure gas is turned off first before removing any parts.

The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If pilot flame goes out for any reason, it shuts the gas off to the pilot jet to prevent unburned gas collecting and causing a safety hazard. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced.

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The pilot light also has a thermocouple that allows gas to the pilot light while the flame is burning. If flame goes out it shuts gas off to the pilot jet. The thermocouple is bypassed by a switch during the initial ignition and once the thermocouple warms up after a minute or two of holding in the bypass switch, it should maintain the pilot. If, after cleaning, the pilot light keeps going out, it would seem that your thermocouple is faulty and needs to be replaced

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