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-   -   Heater keeps blowing fuse (https://www.askmehelpdesk.com/showthread.php?t=295268)

  • Dec 23, 2008, 04:59 PM
    gradeset
    Heater keeps blowing fuse
    Help York heat and air keeps blowing fuse. Connected diret bypass fuse blower motor will run but no heat.
  • Dec 23, 2008, 07:32 PM
    letmetellu

    What fuse are you talking about? Is it a little 3 amp fuse on the circuit board of the furnace. If that is the one then you have a problem with the low voltage wiring. It could be a small wire that has rubbed into the metal of the furnace or it could be two wires touching somewhere in the low voltage wiring.

    If it is the 3 amp fuse do not jumper across it or you can possibily burn up the board or gas valve and change a small problem into a big one.
  • Dec 23, 2008, 07:57 PM
    mygirlsdad77

    Or is it the fuse in the ssu switch located outside the furnace?
  • Dec 26, 2008, 05:10 PM
    gradeset
    Sorry new to this. The fuse is a 8 amp that is located on the ssu switch. We replaced the capacitor and that guess didn't work. So now looking for some real help.
  • Dec 26, 2008, 06:25 PM
    hvac1000
    The SSu switch has a on off switch and a fuse I assume. If you bypass the fuse on a temporary basis you said the blower motor ran? When you turn the thermostat up does the burner come on at all?

    Post the exact model number for the York unit.
  • Dec 27, 2008, 09:40 AM
    gradeset
    Quote:

    Originally Posted by hvac1000 View Post
    The SSu switch has a on off switch and a fuse I assume. If you bypass the fuse on a temporary basis you said the blower motor ran? When you turn the thermostat up does the burner come on at all?

    Post the exact model number for the York unit.

    When we bypassed the ssu switch and fuse the burner came on. Breaker tripped before fan could come on. There is no on off switch on ssu just a plug in for the heater and a spot for the 8 amp fuse. I am assuming its called a ssu switch? The heater is a york diamond 80 about 5 years old. Thanks for any help.
  • Dec 27, 2008, 10:11 AM
    MarkwithaK

    Sounds as if your blower motor has shorted to ground, either internally or somewhere along the external wiring connections.
  • Dec 27, 2008, 10:16 AM
    hvac1000
    I agree I would check out the blower motor first.
  • Dec 28, 2008, 04:33 PM
    mygirlsdad77

    Yep, definitely sounds like blower motor or motor wiring, most likely will need new motor.
  • Jan 18, 2009, 08:22 PM
    gradeset

    Hello again, well I finally was able to get a tech to come out and look at my heater. This is what happened he plugged the unit in bypassing the fuse and it worked great.So he then plugged unit into the fuse switch and is still running. I have no idea what happened but thanks for all help given.
  • Jan 18, 2009, 11:23 PM
    hvac1000
    Strange indeed.

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