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Furnace thermocouple do some furnaces not have a thermocouple?

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Older standard efficiency furnaces have a thermocouple. mid and high efficency models do not. they are electronic ignition with a hot surface igniter

Posted on Nov 25, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: cozy wall heater lights fine then goes out after 3 or 4 minutes

Make sure all the wire connections are good and tight. Next lift off the cover and look for a little thermal disc mounted up by top of the heat exchanger. Most have a re-set button but not all. If you have this ,by-pass it ,see if that solves the problem, if so it may be defective, or doing its job and you have a venting problem. If you don't have this and have changed the thermocouple (was it a copper tube with a fitting that screwed into the gas valve, or did it have 2 wires, that is a pilot generator, kind of same thing) make sure the probe is set correct, with the pilot flame heating the top 1/3rd of the probe. The only thing left is the gas valve.

Posted on Dec 25, 2007

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SOURCE: Heater blower motor cycles on and off (frequently). I have a class 2 LR95329 Honeywell Thermostat

I had the same problem with a Coleman. The problem is the blower relay. You can find this at

Posted on Oct 21, 2008

  • 462 Answers

SOURCE: thermocouple replacement

Maybe you need to approach it differently. Why do you assume you have a bad thermocouple each time? If its because the whole flame goes out and you have to relite it, a lot of things can cause that.
1 ohm out a new thermocouple and record the ohms reading (read tween the center LEAD looking area on the end going into the gas valve and the outer shell (copper colored cover) If its a MV type controls it will have 2 wire ends. With the flame running now check the MV-DC on the same area, as the resistance. Yes you will need 2 hands extra for holding the flame on. It wont stay on without being hooked up. Typically you need 400MV for a thermocouple and 600 is the stahdardf output on a generator with wire leads depending on which you have. If your below these ranges You need to blow out the piulot area with compressed air and retry it. You should get an increase in the milli volts after cleaning because now the flame will hit the pilot or thermocouple or generator as designed and dust was causing it to be lazy and not get enough voltage back to the gas valve to stay on.

Now this is assuming you have the correct pilot orfice and its not too small like with an LP orfice installed on a NG system. The pressures are differant and the hole is way smaller on LP.

This is a really common problem with multi changeouts of thermocouples. Dusty Pilot burners. y policy has always been to blow it out first after observing the type and kind of flame. Then reexamine it after cleaning it out.

If this helps you please rate me as high as you can. If I have not given you enough information please post back so I can better aquaint myself with you problem. Good Luck!

Posted on Mar 23, 2009

  • 92 Answers

SOURCE: Furnace runs about 1 minute, then total shutdown

that sensor as you call it is a thermacouple it produces a small current which lets the gas valve know it is ok to open . if the pilot is not clean and correct it will not let main valve open. if your pilot is good then you have bad gas valve. you may have low gas pressure this can also do what you are describing

Posted on Apr 07, 2009

  • 1 Answer

SOURCE: Wall furnace troubleshooting

Heater lights and the flame pulses high-low high-low until it shuts down. Pilot light stays lite.

Posted on Feb 22, 2010

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I need a thermocouple for my 1978 furnace. where can I get one?

any heating supply store or place will usually have them in stock. if you have a number you can search google for an online place too!!

Nov 10, 2017 | Heating & Cooling

1 Answer

The pilot light of the hot water does not stay lit. Furnace exhaust and hot water tank is common exhaust. How would this effect the problem

Double vent...??

It really won't make any difference.

Your thermo-couple is your trouble.

Every hardware store.... has them (spare: BUY 2).

Take your old one out... for (length) sizing purposes.

They uswually PULL out of the pilot end...

DO NOT OVER-TIGHTEN when re-installing!!!

Thermocouple 24 inch Honeywell for Water Heater or Furnace New eBay
American Water Heater 100108268 Thermocouple Kit 24 eBay

Dec 20, 2016 | Heating & Cooling

1 Answer

I replaced the thermocouple and I can not get furnace to light.

turn to pilot to light pilot
hold and wait should be instructions on control
turn to on position if pilot goes out start again

Nov 02, 2015 | Heating & Cooling

1 Answer

How do I install a thermocouple part #322391 in a Williams gas furnace

Gas furnace will not light. Thermocouple test with the ...

? 4:03
May 12, 2012 - Uploaded by grayfurnaceman
I show how to bench test a thermocouple for a gas furnace using a multimeter. This video is part of the pilot gas furnace playlist.... Pilot Light Won't Stay Lit - How to Replace a Broken Thermo Couple on Furnace - Duration: ...

Oct 29, 2015 | Williams Heating & Cooling

1 Answer


Pretty much the only thing that will do that is the thermocouple not generating enough voltage for the valve to say it's OK.
Usually you need to hold the button for pilot lighting for 60 seconds. You can use a meter to check that it's generating enough power. The thermocouple has to be in the pilot flame properly.

Check this video:

Gas furnace will not light Thermocouple test with the multimeter

Or see this site:
How to Test Thermocouple with Multi Meter Heating and Cooling

Feb 11, 2015 | Cozy Heating & Cooling

1 Answer

Why wont furnace light past the thermol coupler

There is really not enough information here to go on. If this furnace has a thermocoupling, the pilot will need to be lit manually. Follow the manufacturers lighting instructions carefully. If it still will not light you may have a dirty pilot assembly or a defective gas valve. Modern furnaces do not use a thermocoupling. There is no standing pilot light. Each time the furnace needs to be lit it will be done electronically. Many reasons why it wont light in this case. Safety control could be preventing it from lighting for safety reasons. A bad ignitor, ignition module, circuit board, gas valve, pressure switch, gas supply, induced draft motor, blocked or restricted flue pipe, cracked heat exchanger, dirty flame sensor, ect. ect. ect.

Oct 07, 2014 | Coleman 7990-319p Evcon Gas Furnace...

1 Answer

Pilot on my gas furnace won't stay lit

Try cleaning the thermocouple tip if you can see ashes or any buildup on it. If you know the wind isn't blowing it out (had mine blow out from high winds before) then I would change the thermocouple before anything else.

Dec 09, 2013 | Heating & Cooling

1 Answer

No ignition on dayton gas furnace. how hard is it to install new gas valve on a dayton furnace

not hard but before replacing check pilot light and thermocouple for proper function and setting if pilot light not in right position thermocouple wont open gas valve if electronic ignition check for power and proper gap on igniter also check stat for proper function

Oct 31, 2009 | Dayton Gas Furnace Heater

1 Answer


There is a thermocouple "wire" that is supposed to be touching the pilot flame.
The thermocouple senses a flame (hot) and allows the heater to operate. If the thermocouple does not sense that the pilot is on, then it will not allow the furnace to operate.
Bend the thermocouple wire (or the pilot tube) so that the pilot flame is touchingg the thermocouple.

That shouls work now.

The air from the fan should not be blowing through the same cxavity that the pilot is in.
If it is, then you may have a leaking furnace whereby carbon monoxide may be seeping into your living quarters.
If the fix above works and the pilot stays on after the heater starts, then there is probably no leak.

Let us know the results ... post a comment or "RATE" this or another expert's solution.

Sep 16, 2009 | Coleman Propane Forced Air Heater...

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