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Honeywell gas valve will not hold pilot light supply. I see inside what seems to be a permanent magnet with a spring loaded keep plate. but how does the resistance of the thermocouple affect this?

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  • Keith Harmsworth Nov 09, 2008

    Central heating boiler, not air conditioning

  • Keith Harmsworth Nov 15, 2008

    Thanks, I know why the safety is there, but didn't know why it wasn't working.

    I finally found the fault and have now got it working - there was a break in the coil connection inside the valve.



    The bit I don't understand is how resistance in the thermocouple could have any effect on the magnet. I now realise it is not a permanent magnet.

    The magnetism, which is quite strong, is "generated" by an increase in thermocouple resistance (from the heat of the flame of course) this holds a spring loaded plate captive to release the main gas supply.

    There is a "U" shaped peice of iron with a coil of wire wound up each leg of the U and this is connected to the thermocouple - no external power. magic ?

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The resistance of the thermocouple proves that there is flame present at the pilot it is a safty so that unburned fuel deposits do not occur. If your safty valve is magnetic I dont understand your question.

Posted on Nov 15, 2008

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Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
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http://thermocatalytic.com/Thermocouple.JPG
http://homerepairgeek.com/wp-content/uploads/2010/12/furnace-thermocouple.jpg

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