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  1. #1
    Join Date
    Oct 2008
    Posts
    4

    Need help trouble shooting Furnace Startup

    I went to turn the heat on for the winter and it will not come on.

    I am looking for some help in determining what to check for solving this problem.

    I can give you these facts, if I leave something out, please ask!

    .05) The furnace is a gas forced air lenox, circa 1979; with A/C
    .75) There is a 4 conductor wire going from the stat to the furnace.
    1) The thermostat has brand new batteries.
    2) The thermostat appears to be fully functional.
    3) The A/C does work. (Same HVAC system)
    4) The fan does start when I turn the fan switch on the stat to ON
    5) The power switch at the furnace is on.
    6) The gas valves to the house and furnace are on.
    7) The wires that are screwed to the stat are tight and secure.
    8) The wires that are screwed to the transformer on the furnace are tight and secure.
    9) I do not know if the furnace is electronic or has a pilot.
    10) When I raise the temp at the stat, the stat clicks and indicates it is calling for heat.
    11) I did not look to see if the pilot (if there is one) was lit.

    I didn't look for the pilot because I thought it should still turn the blower on even if it wouldn't make heat. Is it possible that the pilot is required for the blower to operate when in heat mode?

    Where do I go next? What color wire (or label) should be coming back from the stat when it calls for heat and what should the voltage be?

    Thanks.
    Jason

  2. #2
    Join Date
    Sep 2008
    Location
    arlington, tx
    Posts
    225
    what costs more a quick service call or a trip to the emergency room

  3. #3
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    1979 huh?

    Must be attached to that old Lennox. By now it should have been replaced.

  4. #4
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
    Posts
    2,032
    Residential HVAC Questions and discussions pertaining to HVAC for the home. No pricing, no DIY, please read Site Rules

    This is posted right above your post.

    What you're asking for is DIY information.

    Call a service company, a unit that old should be looked at very carefully every season anyhow. No better time than when it's not working.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  5. #5
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,180
    Quote Originally Posted by firecontrol View Post
    Residential HVAC Questions and discussions pertaining to HVAC for the home. No pricing, no DIY, please read Site Rules

    This is posted right above your post.

    What you're asking for is DIY information.

    Call a service company, a unit that old should be looked at very carefully every season anyhow. No better time than when it's not working.
    Exactly! Thread Closed!

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