Blower works but no heat

Discussion in 'HVAC' started by pdho172, Jan 21, 2012.

  1. Jan 21, 2012 #1

    pdho172

    pdho172

    pdho172

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    Here is what I known: In the fall I started up my furnace and it worked fine, we have not used our furnace (as we have a wood burner) until yesterday wife turned the furnace on before she left the house when we got home the blower was running but there was no heat. I pulled the panels and there is no flame (auto light system-can not use a match). I also noticed my auto damper position light was not on when it fact the damper was open ( I moved damper manually and light still did not come on). My flue is clear, I pulled pipes to verify, and my filter was dirty but have since changed it. I checked breakers, and fuses that I could see- just the one that controls the blower--. I still do not have flame or heat.

    Carrier year built 1986 Natural gas
    Model (this is as its taken off the label)
    58GS0752-8A
    150
    1088A03387

    Auto damper is
    Johnson Controls Mizer
    M35BE-1

    Any suggestions as to where I can start or what the problem can be before I invest in a service call?
     
  2. Jan 21, 2012 #2

    kok328

    kok328

    kok328

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    Check for power to the control board, check to see if your getting 24VAC to all your limit switches and check to see if your getting 120VAC to the igniter.
    Any blinking lights indicating trouble codes?
     
  3. Jan 22, 2012 #3

    pdho172

    pdho172

    pdho172

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    There is no power to the damper as I have metered that ( I removed the damper and check it for continuity and it appears good), tomorrow I will dig a little further and post my findings. Thanks for the quick response.
    Pete
     
  4. Jan 25, 2012 #4

    pdho172

    pdho172

    pdho172

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    A sensor that shuts the furnace down was tripping, I went up on the roof and the flue has louveers at the exit and they had rusted and closed up on the flue, once i opened it and reset the sensor everything worked great-- My next step is to fabricate new louveers-- and Im good for another season.
    Thanks for your help.
    Pete
     

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