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Pilot light will not stay lit on model 465FX-R wall mounted gas furnace. Thermocouple was replaced but still won't stay lit. Gas is on at the meter. Any suggestions?

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It is possible that gas valve is bad, however, try replacing the pilot orifice located in the pilot assembly. If the flame is inadequate it will not generate the voltage required in the thermocouple. Pilot orifices are less than $10 and can be found at your local heating contractor's parts counter. Bring in the orifice to match.

Posted on Oct 03, 2009

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


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

? 4:03
https://www.youtube.com/watch?v=suen7QlJl4o
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: ...

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I AM WORKING ON A COZY W501E WALL FURNACE AND CANT GET THE PILOT TO STAY LIT. i HAVE CHANGED THE GAS VALVE, THERMOCOUPLE,AND THE SENSOR FOR THE HIGH LIMIT. THE PILOT WONT STAY LIT.


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:
https://www.youtube.com/watch?v=suen7QlJl4o

Gas furnace will not light Thermocouple test with the multimeter

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

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I have a Dayton 3E290 wall heater that was installed new 30 years ago. The pilot light started to extinguish a few years ago. Gradually this began to occur more frequently. I've changed the...


The pilot assembly may need cleaned out and the orifice cleaned, also the gas valve may need to be replaced, to check for proper voltage from the thermocouple you need a flame source and it takes a meter that can register DC milliamps, and should be 350 to 750 millivolts. Heat the thermocouple with the pilot or other flame source and check, if OK, gas valve is weak.

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Pilot won't stay lit, replaced thermalcouple but


I would remove pilot light assembly and clean orifice and blow out gas line to pilot. Check to see that thermocouple is centered in pilot flame. It is possiblethat your gas valve is bad but it is also possible that you got a defective thermocouple. I would change the thermocouple again as they are much less expensive then the gas valves. The next time when you are sure you have the thernocouple mounted as close to the center of the pilot flame hold the pilot button down for several mins. If none of this works then you may have to change your gas valve.Thank you.

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Williams wall furnace 5009622 the pilot light will not stay on


Hi,
The thermocouple is bad and needs to be replaced...
The thermocouple is the copper rod that sticks up into the pilot flame and then screws into the gas valve...
they are sold by lentgh so you need to measure the old one when you go to buy a replacement...

heatman101

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1 Answer

Pilot light will not stay lit; replaced the thermocouple, still no work. Replaced the W/R gas valve 36C04-222 on my Trane furnace. Still not working. any ideas? Could I have gotten a bad replacement valve?...


Trane unit ,same White -Rogers gas valve. I have replaced both the gas valve and the thermocouple . Have agreat robust blue pilot while the button is pushed in , let go and the flame does not stay lit . I checked the milly D C volts and have better than 20 . Is there a problem with the new gas valve or the couple not generating enough volts or is there a safty I do not know about that could be open ?

Dec 15, 2010 | Heating & Cooling

1 Answer

Pilot wont stay lit installed new gas valve and new thermocouple


Is this a standing pilot furnace, or electronic igniton?

If standing pilot, does the heater use a fan to blow air through the heat exchanger?

If the answer to those questions is yes, then check that the pilot orifice is not partially plugged and that there is a strong pilot blowing against the thermocouple. If there is, replace the thermocouple. If not, check the orifice again, and check that the inlet screen to the gas valve is not filled with gas line trash.

If the the pilot flame is good and it continues to go out, the thermocouple magnet in the gas valve may be weak. Replace the gas valve as to get just the magnet and coil is not easy.

Reply back any questions you may have.

Jan 28, 2009 | Dayton Gas Furnace Heater

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A short pilot flame not playing on the thermocouple or a faulty thermocouple , loose connection at the gas where thermocouple is ,

blocked pilot flame to small , air in gas line did he purge the gas line first? other wise you will be there a long time .

Dec 16, 2008 | Dyna-Glo D-E37 Wall Mounted Panel Heater

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The pilot light for the oven went out.



Relighting Your Furnace's Pilot Light

furnace1.jpg - Turn off the gas at the main valve at your utility box - Wait five to ten minutes for gas fumes to waft away - Get a long match—yes, a fireplace match, not a standard match - Set the gas valve on your furnace to "pilot" - Press the red button as you hold the match to the pilot valve - Keep pressing the red button for 30-60 seconds so the pilot can heat the thermocouple. Release the button and see if the pilot remains lit - If pilot goes out, wait five to ten minutes and repeat the process - Once the pilot stays lit, turn the main gas valve back on - If the pilot light continues to go out, call a technician, who may need to adjust or replace your thermocouple or adjust your pilot

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