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    jpmichaels's Avatar
    jpmichaels Posts: 3, Reputation: 1
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    #1

    Dec 29, 2012, 03:45 PM
    Old furnace won't fire.
    My Trane XL 600 (American Standard) furnace is on the fritz. The blower will operate from the thermostat. Jumped R&W @ t-stat and got nothing Jumped @ furnace & got nothing. Fuse is brand new, gas valve is brand new (oof). Standing pilot is lit so thermocouple is good (yes?). I get nothing when t-stat should call for heat. No click and certainly no burner ignition. Could I have a bad (stuck) limit switch? HELP. Forecast is for 24 degrees tonight which is cold in Alabama and I know the tiny ceramic heaters are costing me a small fortune!
    Thanks
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Dec 29, 2012, 04:13 PM
    Make sure the blower door is closed & tight. Also check the gas valve to verify it is set to "on". While we are covering basics, check the emergency & service switches as well as the breaker.
    jpmichaels's Avatar
    jpmichaels Posts: 3, Reputation: 1
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    #3

    Dec 30, 2012, 07:59 AM
    Grady,
    Door is closed tight, gas valve is open (pilot is burning) and the switches are on. Any other ideas?
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #4

    Dec 31, 2012, 02:57 PM
    Since the blower operates from t he stat, we can eliminate a transformer problem. An open limit is a possibility but when a limit is open, the fan usually will stay on to "cool" the furnace. With yours being older & standing pilot, that may not be the case. If there is a readable wiring diagram on the furnace, can you take a picture of it & either post here or on a photo sharing site such as photobucket?
    jpmichaels's Avatar
    jpmichaels Posts: 3, Reputation: 1
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    #5

    Jan 3, 2013, 12:51 PM
    Diagram is illegible.

    I have checked the limit switches and they all ohm out good (0.002 or less when stone cold) I replaced the thermocouple and re-lit the pilot (because it's inexpensive and humored my father).

    So, we have new gas valve, apparently good limit switches, a new t-couple and a lit pilot but no burner ignition. I'm going to try another thermostat that I know to be good to see if that could be the problem.
    It's cold in here!
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #6

    Jan 3, 2013, 05:57 PM
    Something super simple I skipped earlier is to verify the gas valve is set to "on" & not "pilot".

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