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iducer vent motor

R. Toney
R. Toney Member Posts: 5
in THE MAIN WALL
Thanks, I'll check the temp rise and see where I'm at.

Comments

  • R. Toney
    R. Toney Member Posts: 5
    Furnace overheating

    I am working on an upflow gas furnace and the furnace keeps overheating. I am getting flashing red LED on circut board and the fault code is open limit circut. I thought at first it was the limit switch, but as I investigated the furnace, I found that the vent pipe from the inducer motor is exceptionly hot. I think the limit switch is doing its job. I disconected the vent pipe and checked/looked for obstructions and everything looked good.The iducer motor seems to be running but its very hot to the touch. Could the isducer motor be intermittently going bad and causeing my problem? I would appreciate any comments and help in this area. Thanks, Robert.
  • Sweet_2
    Sweet_2 Member Posts: 143
    Inducer motor

    Its possible that your furnace may be overfired check your temp rise make sure its within range of furnace specs.
  • hvac64
    hvac64 Member Posts: 24


    Have you checked the filter and coil(s) to see if they are clogged. What about duct sizes? When I find open limit swithches I go right to those 2 things. Check the temp. rise with filter in then with it out. Alot of these so called "efficient" filters can really kill the air flow in systems. Good luck.
  • lchmb
    lchmb Member Posts: 2,997
    How much

    How much flow are you getting out of the vent? It is also possible that the blades on the motor are gone.
  • R. Toney
    R. Toney Member Posts: 5


    Thanks for the info. I'll check the temp rise with filter in and out to see where I'm at. If temp rise is high can I increse blower speed to bring the temp rise down. Also, the coil looks fine.
  • R. Toney
    R. Toney Member Posts: 5


    Thanks for the info. I went on the roof and checked the vent pipe and it is venting how much I really couldn't tell. It sure does seem like its possible the inducer fan blades could be shot. I'll pull the fan off tomorrow and check.
  • Sweet_2
    Sweet_2 Member Posts: 143
    R. Toney

    Definetely check filter. Are you at altitude by chance above sea level? If so it sounds like air/fuel mixture is off. Might want to check manifold gas pressure . Check what manufacturer requires for manifold pressure .
  • Sweet_2
    Sweet_2 Member Posts: 143
    I dont think

    pressure switch would close unless d.i. was pulling enough vacuum. Although thats not a guarantee.
  • Glenn Harrison_2
    Glenn Harrison_2 Member Posts: 845
    Would you please share with us the...

    Brand and model# of the furnace, and the exact code light sequence you are seeing. This should provide more insight into your problem.
  • jim lockard
    jim lockard Member Posts: 1,059
    think your right

    If one little bees nest can shut the furnace down then a fan without blades ??
  • R. Toney
    R. Toney Member Posts: 5


    Thanks Jim...
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