furnace pilot light keeps going out

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On Mon, 11 Feb 2013 02:42:38 -0600, themattfella

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On Fri, 08 Feb 2013 13:29:46 -0600, themattfella

It is a "thermocouple" which by definition is electric - 2 dis-similar metals joined which produce a voltage when heated.

single unit - and must be replaced without damage. Measure the length and buy a "universal replacement thermocouple" of the same or next longer length. The "universal" kit has all the required parts to connect it to virtually any gas valve and pilot ass'y.
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snipped-for-privacy@snyder.on.ca;3010834 Wrote: > Measure the length and buy a "universal replacement thermocouple" of > the same or next longer length. The "universal" kit has all the required > parts to connect it to virtually any gas valve and pilot ass'y.
Actually, it doesn't matter how long your replacement thermocouple is, provided it's long enough to reach from the pilot light to the gas valve. Thermocouples are like extension cords in that respect; you can always use a longer one to replace a shorter one.
If it's a Friday night before a long weekend, and the only store in town that's open has a 6 foot long thermocouple, you can still use it to replace an old 24 inch thermocouple.
I just thought I'd clarify that point in case any newbies reading this got the idea that you had to replace the thermocouple with one of similar length. If you can get the same length as the old one, great. But, any longer thermocouples will also work for you.
--
nestork


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responding to http://www.homeownershub.com/maintenance/furnace-pilot-light-keeps-going-out-736030-.htm DA wrote: themattfella wrote:

This part is interesting: what makes the clunk? it's own gas valve or something else in the room? Do you have a second appliance sharing the same flue? A water heater for example? This sounds like there may be either a blow-back from it coming on or otherwise a downdraft from when it shuts off. See if you can time the clunk/pilot going out with the second appliance (if there is one of course) because the remedies will be different for when it turns on or off.
Lacking the second appliance, it can be a defective thermopile/pair shutting the gas valve off "thinking" pilot went out while the pilot is still OK.
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On 02/08/2013 11:44 AM, DA wrote:

something else in the room? Do you have a second appliance sharing the same flue? A water heater for example? This sounds like there may be either a blow-back from it coming on or otherwise a downdraft from when it shuts off. See if you can time the clunk/pilot going out with the second appliance (if there is one of course) because the remedies will be different for when it turns on or off.

Presumably it is a solenoid valve closing so as to shut off gas to the pilot light when it detects an unsafe condition. Does anyone agree with that?

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On Fri, 08 Feb 2013 13:31:37 -0600, themattfella

something else in the room? Do you have a second appliance sharing the same flue? A water heater for example? This sounds like there may be either a blow-back from it coming on or otherwise a downdraft from when it shuts off. See if you can time the clunk/pilot going out with the second appliance (if there is one of course) because the remedies will be different for when it turns on or off.

That is what the thermocouple is for - to tell the gas valve to stay on as long as the pilot is lit, and shut down when it fails.
There is a SLIM chance that removing the connection from the gas valve and gently cleaning the contact on the end, then re-tightening it MIGHT make it work. I've had ONE that did, at least for a couple of months.

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On Friday, February 8, 2013 7:44:04 AM UTC-8, themattfella wrote:

If replacing the thermocouple doesn’t work then try removing and cleaning the pilot orifice. Little spiders love making a nest there. Just because t he flame is blue doesn’t necessarily mean that its adequate.
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On Fri, 08 Feb 2013 09:44:04 -0600, themattfella

sensor.
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