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    Furnace blower on - no Heat

    Asked Oct 13, 2007, 04:04 PM 20 Answers
    I have a Carrier furnace with an automatic ignition. The fan is constantly running but it is not heating.

    Additional Information:
    Model 58PAV: The Red Led Status light is rapidly flashing - which according to the manual means 'Line voltage (115VAC) polarity reversed. If twinned, refer to twinning kit instructions'. I do not have a clue what 'Line voltage (115VAC) polarity reversed... ' means. The Furnace was working fine last year and no one touched any wires -- how did the polarity get reversed?

    I will really appreciate if someone can explain to me what can I check and how?

    Thanks

    Last edited by aulakhbs; Oct 13, 2007 at 09:32 PM.
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    20 Answers
    norepairguy's Avatar
    norepairguy Posts: 1, Reputation: 1
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    #21

    Oct 10, 2009, 04:49 AM
    Hi all ,just figured out why carrier furnace won't fire due to code 13 error. I removed front of ignition box cover with the round site glass near top furnace casing. On the right hand side of the box there is a small disc about the size of a penny with two red wires on outside of box , cleaned with finger by rubbing dust off it.Code went away quickley and furnace fired up (nice blue flame) Problem was dust on sensor. Just installed drywall in other side of basement and fine powder got through filter.So I also checked outside for bugs bees birds nests inside exhaust tube and found nothing however there was a sizable bees nest in my water heater exhaust pipe(probably avoided a situation in the near future with hot water tank).If you can do the little things yourself you may avoid a pricy bill from your repair guy.It was not hard and you feel good for your effort.
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