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    gradeset's Avatar
    gradeset Posts: 7, Reputation: 1
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    #1

    Dec 23, 2008, 04:59 PM
    Heater keeps blowing fuse
    Help York heat and air keeps blowing fuse. Connected diret bypass fuse blower motor will run but no heat.
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #2

    Dec 23, 2008, 07:32 PM

    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.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Dec 23, 2008, 07:57 PM

    Or is it the fuse in the ssu switch located outside the furnace?
    gradeset's Avatar
    gradeset Posts: 7, Reputation: 1
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    #4

    Dec 26, 2008, 05:10 PM
    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.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #5

    Dec 26, 2008, 06:25 PM
    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.
    gradeset's Avatar
    gradeset Posts: 7, Reputation: 1
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    #6

    Dec 27, 2008, 09:40 AM
    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.
    MarkwithaK's Avatar
    MarkwithaK Posts: 955, Reputation: 107
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    #7

    Dec 27, 2008, 10:11 AM

    Sounds as if your blower motor has shorted to ground, either internally or somewhere along the external wiring connections.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #8

    Dec 27, 2008, 10:16 AM
    I agree I would check out the blower motor first.
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #9

    Dec 28, 2008, 04:33 PM

    Yep, definitely sounds like blower motor or motor wiring, most likely will need new motor.
    gradeset's Avatar
    gradeset Posts: 7, Reputation: 1
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    #10

    Jan 18, 2009, 08:22 PM

    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.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #11

    Jan 18, 2009, 11:23 PM
    Strange indeed.
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