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Wall furnace troubleshooting

My 20yr. old wall furnace pilot keeps going out. I know the thermocouple may be the problem, but I am wondering if a resistance check of this part can be performed to check. I also wonder about how I can check the "safety" shut-off devices designed to stop heater if they detect improper venting or other problems.

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  • pijo30 Apr 04, 2009

    I have the same problem of the pilot light going out or not wanting to stay lit at times. I thought it was blowing out from drafts. I also thought the thermocouple only sends the signal to open the gas valve after you raise thermostat. does the pilot go out on it's own if the thermocouple is bad?

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A thermocouple is inexpensive.  Replace if in doubt.  Get a professional in to do safety checks.  You may also want that individual to replace the thermocouple.

Posted on Nov 26, 2008

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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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1 Answer

The pilot goes out when the heater cycles


The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

Feb 18, 2015 | Williams Wall Heaters: 50,000 BTU/Hr...

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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

Feb 11, 2015 | Cozy Heating & Cooling

1 Answer

Vulcan Quasar wall furnace, pilot will lit and burner starts but goes out after a few minutes. sometimes pilot will relight but most often fails to light till unit cools down. Any suggestions?


You may need a new thermocouple if you have been able to light it before.It is located above the pilot lite and needs to get hot to keep the gas flowing.You can pick up a universal thermocouple a the local hard ware store.Shut the gas off,unscrew the coupling nut and remove the old one.Bend the the new one like the old one and replace.Try not to kink the new one.Good luck and thanks for choosing FixYa.com.

May 15, 2011 | Heating & Cooling

1 Answer

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

Jan 06, 2011 | Williams (5009622) Ceramic Gas Wall...

1 Answer

How do you turn the pilot light back on? This is an older model, probably about 10 years old or so.


Move the gas valve knob to the PILOT position and press down on the knob. You will be pressing down on a spring loaded safety magnet. Now light the pilot and keep holding down the knob till the thermocouple gets hot enough to produce electrical current and hold that spring loaded magnet in. This is your safety device. If the heat gets too hot the furnace has a fuse in line with that magnet.
When the pilot stays lit by itself without you having to hold down the button then advance the knob to the ON position. Then go to the wall thermostat and turn on the heater.

HOW IT WORKS: WILLIAMS WALL HEATER

Nov 11, 2010 | Williams 6508732 Gas Heater

1 Answer

How and where do I replace a thermocouple on a warm glo wall furnace? Help


There should be a thermocouple in front of the burners that has a copper colored wire that runs from the gas valve to the thermocouple. It is located in the pilot flame as it is a pilot proving switch that tells the gas valve the pilot is lit and its okay to open the gas valve to the main burner.

Mar 21, 2010 | Desa International Blower Glow Warm Wall...

1 Answer

Pilot Light won't stay lit on wall furance


The low voltage wiring and the thermostat has noting to do with the pilot function of the wall furnace, check to see if when you have the pilot lit manually, while holding the button in does the flame impinge on the thermocouple and does the flame try to wrap around the thermocouple? if not the thermocouple and pilot flame need to be adjusted so that it impinges on the TC, if it does have a good flame impingment, then you probably have a bad TC from the factory, call them and have them send you a new one if still under warrenty.

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1 Answer

Pilot lights fine, furnace fires up, when it turns off the pilot goes out


need to have at least 3 feet of vent out of the roof, if it is to low the coll air will cold soak down to the pilot and shut it down.

Nov 08, 2008 | Cozy (W352E) Heater

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