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Fuse Blows when diagramed wiring is used on GMP125-5

I use 3A and 5A fuses. Wired everything just as it is in the service manual and it blows a fuse almost everytime. I've tried variations of grounding...I know the unit is good, but am baffled. Was able to get it to run the cooling system but it wound up bypassing the heating system. it's almost like it's telling me "you can only have one or the other bubba!"

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I would check your thermastat wiring if you blow the fuse you have a dead short those fuses are saving you alot of money. remove all wires from terminals for t stat on furnance and jump between r and w if it works your problem is in wiring ..........

Posted on Feb 26, 2009

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Posted on Jan 02, 2017

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