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My thermocouples only last for about 6 mos. at least the furnace will not stay lit with them? This is an older model possibly the 70s?

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  • mthesen2 Sep 15, 2008

    these thermocouples last 6 months at the longest and this is in a furnace ,nothing to do with an a.c.unit The heating furnace is from the 70s or maybe 80s
    pilot goes out and can not be relit until I change thermocouple?

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Basically the heavier gauge copper wire the longer they will last... are they exact replacements for the original thermocouple and you are following the correct replacement procedure i presume. sheathing on the wires of course will make them last longer as well.

as the furnace is that old i'm uncertain that you are able to get an original replacement. be that as it may if you can, find the specifications on it and find a good replacement and more durable replacement.


Robert

Posted on Sep 15, 2008

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Sound like air flow problem to me, the inside and the outside. check the inside filter to see if it's clean and clean the outside condenser coils by washing it.

Posted on Sep 15, 2008

  • Legin Varghese
    Legin Varghese Sep 15, 2008

    I am thinking more along the lines that you have a restriction
    somewhere in the condenser sheet coil, or the condenser line coming
    from the compressor. If you have no suction pressure this would explain
    a restriction.I would check filters if you have them installed.

    On a side note the pressure of refrigerants change due to the increase
    and decrease in temperature. So depending on the temperature would
    determine the pressure of the refrigirant.

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1 Answer

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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Sounds like the thermocouple is shot

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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.

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I have a older Miller furnace(1989)the pilot will stay lit


Replace the thermocouple.

Try this, do you have a butaine stick lighter? Try to heat the thermocouple with it ... see if you can get the main burner to come on. If not - definitely, replace the thermocouple.

Thanks for your question.

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


The clicking noise is a relay or switch of some sort. You are right about that. I have 2 questions. 1) does the thermostat have a mercury bulb in it? 2) when the fan shuts off and on, does the burner stay on?

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