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Thread: Furnace not working? READ HERE FIRST!!

  1. #1
    Join Date
    Feb 2012
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    Exclamation Furnace not working? READ HERE FIRST!!

    Furnace Troubleshooting Flash Codes

    Do not respond to this thread for furnace problems! Please start a new thread.


    This thread is a work in progress. More furnace models will be added as information is obtained. (If you have your furnace manual handy, see below to help us)

    Please help us!


    If you have a manual for your furnace, please reply to this thread with the following info: make and full model of your furnace (from your nameplate), list of all codes and their meanings (please type this word for word), and somewhere in your manual it will list the models or series that your manual is for. I need this too.

    Ideally, I would rather see a picture of the section of the manual with the codes. You can also take a picture of the troubleshooting guide that is often on one of the covers. This will help with typo's.

    If you know of a link to your (or any) manual, please post it!

    Do not respond to this thread for furnace problems! Please start a new thread.
    Thanks!

  2. #2
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    Default Rheem Criterion II RGPH, RGPJ, RGLH, & RGLJ series furnaces

    Rheem Criterion II RGPH, RGPJ, RGLH, & RGLJ series furnaces

    POWER LED (green) indicates that the furnace has the correct power being supplied.
    FLAME LED (yellow)
    • Solid on indicates flame detected
    • Flashing or off indicates a weak flame detected (dirty or failing flame sensor)

    OK LED (green) blinks to indicate the following faults:
    1 flash followed by a 2 sec. pause: 1 hour lockout.
    • Check and clean flame sensors, check ignitor, ignitor position, gas valve voltage


    2 flashes followed by a 2 sec. pause: Pressure switch is open.
    • Check for blocked air intake and exhaust, inducer operation, pressure switch operation


    3 flashes followed by a 2 sec. pause: Limit switch is open.
    • Check your filters, lack of filter (never do this), closed or blocked registers or cold air returns, blower belt, blower failure


    4 flashes followed by a 2 sec. pause: Pressure switch closed.

    5 flashes followed by a 2 sec. pause: Twinning fault
    • Used in multi furnace operation only

  3. #3
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    Default

    KeepRite Model# C8MPN075B12B1
    Thanks to user efciem from Self Help Forums (our old board)!!

    Furnace not working?  READ HERE FIRST!!-5q8ix-jpg

  4. #4
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    Default

    Armstrong Furnace
    These codes should work with Armstrong Ultra V Tech 80 series (G1N80....) and CG80 series furnaces.

    Please reply if your furnace uses these codes too. Please mention the Armstrong posting and give us the series and full model number of the furnace so I can add to the list.

    Thanks to users mksmith and swashbuckeler from Self Help Forums (our old board) for the info!
    Furnace not working?  READ HERE FIRST!!-armstrong-jpg

  5. #5
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    Default

    Default Flash codes Lennox
    here are the codes for my Lennox G50UH-36A-070X-12 (complete model number from data sticker inside access panel)

    Thanks to user removeb4flight from Self Help Forums (our old board) for the info!
    Furnace not working?  READ HERE FIRST!!-flashcode-jpg
    Last edited by Mr T; 02-08-2015 at 09:34 AM.

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