Help York heat and air keeps blowing fuse. Connected diret bypass fuse blower motor will run but no heat.

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.

Or is it the fuse in the ssu switch located outside the furnace?

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.

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.

Quote:

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Originally Posted by 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.

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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.

Sounds as if your blower motor has shorted to ground, either internally or somewhere along the external wiring connections.

I agree I would check out the blower motor first.

Yep, definitely sounds like blower motor or motor wiring, most likely will need new motor.

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.

Strange indeed.