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Good Afternoon from Florida!! I have a two year old Goodman Model GPC1242H41CA package unit that has heat strips, I had a short that eneded up causing me to replace the transformer and the control board. I ended up replacing the thermostat and wires as well and now the AC side works perfect but when it is changed to heat it blows the 3 amp low volt fuse and heat will not work. I replace the fuse and turn it back on to heat and it again blows the fuse....I dont understand why the cool works fine but the heat is blowing the fuse. I have checked the heat strips and nothing is broken or touching anywhere so I am kind of at a loss right now and could use some advice. Thanks!!!!!!

  • I believe it is the sequencer that's bad but not sure yet haven't had time to test it yet. – JP83 Dec 8 '17 at 19:09
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    There must be some sort of relay or something that takes the 24V call for heat, and turns it into flowing a huge river of 240V electrons at the heating elements. It sounds like that relay is shorted. – Harper - Reinstate Monica Dec 8 '17 at 19:12
  • That model number does not google, might want to check it for accuracy or inadvertently including bits that are not part of the model number. I tried trimming off GPC and CA, still no luck. – Harper - Reinstate Monica Dec 8 '17 at 19:14
  • Since you admit to replacing the thermostat and wiring, you're going to need to double check all the connections and make sure each wire goes to the right terminal. The thermostat could be the "short" that blows the fuse if the wrong wires are being used. The new wire could also be physically damaged or kinked somewhere causing a short. – JPhi1618 Dec 8 '17 at 20:18
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My guess is there is a short in either the W wire or in one of the heating components. If it happens immediately it is probably in the W wire. If it goes for a while it is probably in one of the components and when that component is energized the fuse blows. Try disconnecting the thermostat wires from the unit and jump R to W. If it works your problem is in the thermostat or thermostat wires. If it stil blows the problem is in the unit itself. They do make things called poppers that are basically circuit breakers instead of fuses that fit where automotive fuses go. Saves a lot on fuses when not sure where the problem is.

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