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  1. #14
    Join Date
    Dec 2005
    Location
    Virginia Beach, Va.
    Posts
    250
    Go to the upper left corner of the t-stat & select EM HEAT, & see if the furnace stay’s on, if you have a washable, or heavy pleated return filter remove it!

    Here’s a pdf. File of your owners manual

    http://www.lennox.com/pdfs/manuals/L...0%20Manual.pdf

    hope this helps you get some temp heat

  2. #15
    Join Date
    May 2008
    Posts
    45
    It doesn't work in either EM HEAT or HEAT mode. The furnace comes on once after we restart the system, but then it won't come on again. The filter is brand new...only been in there about a week.

  3. #16
    Join Date
    Dec 2005
    Location
    Virginia Beach, Va.
    Posts
    250
    Removing you filter, is to maximize our air flow, if you’re locking-out on high limit. Is this furnace condensing (is the flue pipe metal or plastic)

  4. #17
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,581

    Thumbs down Lennox heat pump headache

    Quote Originally Posted by 1894House View Post
    It doesn't work in either EM HEAT or HEAT mode. The furnace comes on once after we restart the system, but then it won't come on again. The filter is brand new...only been in there about a week.
    If the furnace does not come on em-heat then it's wired wrong.Better find someone else who knows heat pumps and duel/fuel systems, before you damage a compressor.

    Can't give you any help with wiring, due to site rules. But, I would say that either the thermostat is set-up incorrectly or miss wired.

    Heat pump is first stage and furnace is second stage , but you Can Not run furnace at the same times as heat pump or compressor damage will occur.Thus the need for outdoor stat.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  5. #18
    Join Date
    May 2008
    Posts
    45
    2nu-the pipe is plastic. aircooled-the furnace may or may not come on in either em heat or heat mode...it's totally temperamental...one time it works another it doesn't. Some days the system works without a hitch and others, like today, we come down in the morning to a frigid house and it stays that way until the system decides to fix itself. It seems like the colder the weather is getting, the more the system is not working (maybe because it is depending more on propane than hp?).

  6. #19
    Join Date
    Dec 2005
    Location
    Virginia Beach, Va.
    Posts
    250
    Ok from what you have expanded to me, your t-stat acting as the dual-fuel controller has went into heatpump termination. This is expected as due to lower ambient deceases heat capacity, ideally switched near balance point. Why I asked if the furnace is condensing,
    (ICE) drain lines without heater tapes, concentric termination covered in ice from the flue being plumbed backwards. Lock-out will not always run the indoor blower if the sequence of operations doesn’t make it that far. If you turn the emergency switch off for a min. and back on, does the furnace start-up. I’ve gotta go
    Last edited by 2nu2no; 11-23-2008 at 02:13 PM.

  7. #20
    Join Date
    May 2008
    Posts
    45

    error code

    I checked the furnace and it flashes an error code of what appears to be 43. A red light flashes four times with a brief pause and then three times with a long pause then repeats.

  8. #21
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    Quote Originally Posted by jrbenny View Post
    Can a Lennox expert comment on the wiring of the remote sensor? Should it be in its own bundle? Does it need to be shielded cable?

    outdoor sensor is to be wired with 2 conductor thermostat wire, it CAN be wired with 2 wires of a multi conductor cable.

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