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  1. #1
    Join Date
    Mar 2007
    Location
    Dallas Texas
    Posts
    7

    Furnace quit in middle of night. -AC on display.

    Wife said furnace went off sometime in middle of night.

    Has a minus ac on the display of thermostat. She tried to turn it up and it wont kick on at all. Assumed thermocuple and its not letting gas kick on so the furnace can start. Thought I would post here real quick and see.

    Im not home to grab model numbers or serial numbers of furnace or thermostat. Will be later tonight if you need it.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,125
    Check the circuit breaker.
    If its tripped, reset opnce only. If it trips when you reset it, call a tech.
    If the furnace works ok after resetting break, call and schedule a check up to find what caused the breaker to trip.

    PS: Check if there is an emergency switch that got turned off accidentally.
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  3. #3
    Join Date
    Mar 2007
    Location
    Dallas Texas
    Posts
    7
    Beenthere,

    thatnks for the quick response. I was not home last evening or this morning. On my way here in the next few hours.

    will check panel in gargae. Would there maybe be circuit on furnace in attic somewhere?

  4. #4
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,176
    That's as far as we can go with help. You have no AC power to your stat. You need a service technician.

    This is not a DIY board.

    Please review the forum rules.

    Thank you!

  5. #5
    Join Date
    May 2007
    Location
    somewhere between heaven and hell
    Posts
    957
    Also check your filter if it is losing power through limit switch filter could be dirty and check filter anyways if it isn't this sympton. Dirty filter will cause loss of 24v to thermostat if it is tripping out on limit. Not sure what else to tell you without DIY which is not allowed here.

  6. #6
    Join Date
    Jan 2007
    Location
    pittsburgh
    Posts
    504
    Quote Originally Posted by mrlighturfire View Post
    Also check your filter if it is losing power through limit switch filter could be dirty and check filter anyways if it isn't this sympton. Dirty filter will cause loss of 24v to thermostat if it is tripping out on limit. Not sure what else to tell you without DIY which is not allowed here.
    Dirty filter, tripped limit, WILL NOT cause loss of power to t'stat. Check any fuses or breakers and if those are ok, than call someone.

  7. #7
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,189
    Yes it will. Take a look at a Carrier wiring diagram.
    Perhaps you should have read the instructions before calling.

  8. #8
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,744
    Quote Originally Posted by gpjazz1023 View Post
    Dirty filter, tripped limit, WILL NOT cause loss of power to t'stat. Check any fuses or breakers and if those are ok, than call someone.


    it will on EVERY Lennox furnace made in at least the last 15 years...........


    what others said and check bottom door of furnace to make sure its on right.

  9. #9
    Join Date
    Aug 2006
    Location
    Chelmsford MA
    Posts
    1,518
    Maybe she switched the t-stat to a/c instead of heat. See that was easy.
    We only want to do it, if we can do it right.

  10. #10
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,744
    Quote Originally Posted by nashobasales View Post
    Maybe she switched the t-stat to a/c instead of heat. See that was easy.


    then the stat would say +AC..........

  11. #11
    Join Date
    Jan 2008
    Location
    Hells Kitchen, Phoenix Arizona
    Posts
    318
    -ac on a chronotherm means no ac voltage to the R terminal...Most of them will say that even if they have battery backup...
    "Overkill is an often underrated achievement", Will Hayden -- Red Jacket Firearms

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