Goodman furnace GMT115-5B Turn fan to on on thermostat blower comes on Circuit board blows 3am fuse immediately when furnace turned on. Checked all safeties with ohm meter to ground. No problems. Took wires all off the safeties and eliminated them one by one. When I got to the limit switch immediately blew 3 am fuse. Bypassed limit switch still blew 3 amp fuse. Replace circuit board?
Bypass the tstat first but that's where I'd be leaning.
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SOURCE: keeps blowing the fuse.
Most likely it's near where the wires got weed wacked outside. Follow the wires from the indoor unit to the outdoor unit. Look for any damage along the way. Also follow any thermostat wires you can find and inspect them. Sometimes where they enter into both the inside and outside units they frey on the metal casing. I hope you find something. Otherwise, you may have a bad transformer sending the wrong voltage to components.
SOURCE: Goodman furnace
double check your wiring. R terminal on the furnace will provide 24 volts to the t-stat. W terminal in the t-stat will send 24 volts back to the furnace W terminal to turn on the heat. G terminal in the t-stat will send power to the G terminal in the furnace when the t-stat is switched to fan on. Y terminal in the t-stat will send power to the Y terminal in the furnace which in turn will send 24 volts to the A/C outside. The C terminal in the furnace should be connected to the c terminal in the A/C outside as well as to the T-stat. Check the fuse again
SOURCE: I have a goodman GMP 125-5 furnace. I have
sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition
SOURCE: fuse blow each time I turn on air check for
disconnect the thernostat wires from the control board. Put a jumper wire between R & G put door back on and turn on power. Blower motor
should run, if it blows the fuse then you have a direct short between R &
G at the board. Do this with R and W(heat) and R & Y(cool).
By disconnecting the thermostat wires and reinserting them make sure that they do not touch when inserted into each terminal. If it still blows
that little 3amp fuse when jumpering between each sequence as mentioned above, then I think your board is bad. When Jumpering out the Y terminal you will have to have the AC wires still hooked up. If it
blows the fuse in that sequence. Disconnect the wires out at the condensor.
You mat have a bad contactor at the outdoor unit.
SOURCE: GMT070-3b goodman furnace. Vent fan wasn't
Look on the inside of furnace door/front cover it tell you what the code one means. It sounds like you have a thermostat problem.
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