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  1. #1
    Machine Gunner bellavite1's Avatar
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    Jul 2009
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    Wheatridge
    Posts
    1,939

    Default HELP with furnace in Wheatridge!!!

    Stupid furnace is driving me crazy.

    Changed igniter, pressure switch, tried different thermostat, changed board (not positive that it is a good one, though).

    Completely random issue: will run great for a few days and then will start acting up for no discernible reason.

    Ignites, runs for a few secs and then turns itself off.
    The board gives 8 blinks, no idea what that means, the manual troubleshooting guide only goes up to 7 blinks...

    Reboot it enough times it eventually restarts, but not this time.

    Currently with no heat.

    Who is the forum go-to-guy?

    I NEED HELP!!!
    NIL DIFFICILE VOLENTI

  2. #2
    Machine Gunner
    Join Date
    Jan 2007
    Location
    Longmont, CO
    Posts
    2,180

    Default

    See if you have a temp sensor in the path of the gas flames. Not sure of the name. Single wire attached to it. It?s L shaped and one tip is blasted by furnace flame.
    When mine get dirty I get an on off cycle that turns burner on and then off in 30 seconds. Repeats constantly


    To fix this. Remove sensor. Using steel wool clean off the contamination. Reinstall. Spend money you saved on guns.

  3. #3
    Machine Gunner
    Join Date
    Jan 2007
    Location
    Longmont, CO
    Posts
    2,180

    Default

    It?s called a furnace flame sensor.

  4. #4
    Joe_K
    Guest

    Default

    Quote Originally Posted by bellavite1 View Post
    Stupid furnace is driving me crazy.

    Changed igniter, pressure switch, tried different thermostat, changed board (not positive that it is a good one, though).

    Completely random issue: will run great for a few days and then will start acting up for no discernible reason.

    Ignites, runs for a few secs and then turns itself off.
    The board gives 8 blinks, no idea what that means, the manual troubleshooting guide only goes up to 7 blinks...

    Reboot it enough times it eventually restarts, but not this time.

    Currently with no heat.

    Who is the forum go-to-guy?

    I NEED HELP!!!
    Last edited by Joe_K; 01-10-2023 at 18:20.

  5. #5
    Grand Master Know It All
    Join Date
    Mar 2006
    Location
    Dickshooter, ID
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    4,828

    Default

    Quote Originally Posted by Erni View Post
    It?s called a furnace flame sensor.
    This. They cost about $8.
    Last time I had a service call it cost $330 to have it put in while I was put of town

  6. #6
    Machine Gunner bellavite1's Avatar
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    Jul 2009
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    Wheatridge
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    Default

    I have already cleaned it
    I went to a place to get my pressure switch today and they wanted $60 for a flame sensor.
    That's because most places don't sell retail, only wholesale to HVAC companies.
    Regardless, once it's cleaned, it is just a piece of metal, not much can go wrong there.
    Any of our members in the trade at all?
    NIL DIFFICILE VOLENTI

  7. #7
    Machine Gunner electronman1729's Avatar
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    Apr 2011
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    Arvada
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    1,794

    Default

    Not a forum guy, but Tobin Heating is the guy.
    Deplorable millennial born 30 years too late

  8. #8
    Paintball Shooter
    Join Date
    Jul 2012
    Location
    Denver
    Posts
    34

    Default

    I have been having the same issue with my furnace. It will turn on for 10-15 seconds and then turns off.
    I would be sitting at home and then thinking to myself "Dang it is getting cold in here". Would have to turn power of/on several times then the furnace would stay on.
    Going to look at the flame sensor and clean if needed. Thanks for this thread. Hopefully I will save myself a $330 service call for an $8 part.

  9. #9
    Machine Gunner
    Join Date
    Jan 2007
    Location
    Longmont, CO
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    2,180

    Default

    Quote Originally Posted by bellavite1 View Post
    I have already cleaned it
    I went to a place to get my pressure switch today and they wanted $60 for a flame sensor.
    That's because most places don't sell retail, only wholesale to HVAC companies.
    Regardless, once it's cleaned, it is just a piece of metal, not much can go wrong there.
    Any of our members in the trade at all?
    Hmmm. It could have gone bad too. Did u look up the board and see what the blinking light code means?


    Sent from my iPad using Tapatalk

  10. #10
    Machine Gunner bellavite1's Avatar
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    Jul 2009
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    Wheatridge
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    Default

    I just put back the old pressure switch and it fired up.
    Will probably work for a few days and then we'll have issues again...
    I guess the board is the next thing?
    Hopefully I can return the switch and put it toward a control board.
    NIL DIFFICILE VOLENTI

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