Question about Goodman GMS90703BXA Heater

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Goodman GMP75... keeps blowing fuses only in A/C mode. Only when I connect yellow wire from thermostat to line going to condenser contactor (24V side).

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Are you talking about the small 3 or 5 amp fuse in the furnace? If you are then the control voltage circuit to the condenser is shorted, Maybe dogs or rodents chewing it or the insulation is cut by a sharp piece of metal. Sometimes the contactor will go bad and cause the small fuse in furnace to blow. Look for the simple things first, like control wires shorted. Make sure the yellow wire from the thermostat goes to the outside unit and not to the common.

Posted on Jun 30, 2009

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I have a goodman furnace and ac unit the fan and heat work but every time i turn the ac on it blows the low voltage fuse ive replaced all low voltage wires to outside unit and thermostat i also replaced...


Look at the contactor on the condensing unit, remove the low voltage wires to the contactor and turn on the system. If the low voltage fuse doesn't blow, replace the contactor.

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1 Answer

Rheem RGPH 07EAMGR keeps blowing 2A 250V fuse from transformer to circuit board. I can't find a short and the fan will come on for a 20 seconds then the fuse will blow again. i have done this 4 times(i had...


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