August 9th, 2010, 11:19 PM
Goodman GMP050-3 furnace blowing fuses
I have a Goodman GMP050-3 furnace that started blowing the 3 amp fuse on the circuit board when the thermostat is turned on. The heater worked fine during the winter. Now the fuse blows whenever a/c or heat is selected (and temp adjusted). Previously only blew when the fan switch was turned ON. I just had a newer a/c installed and it continuously runs even when the thermostat is turned off. The old a/c did the same thing right before I stopped using it earlier this year.
The thermostat is a Ritetemp and i just pulled it off the wall (thermostat was turned off). The a/c stopped running. Could the thermostat be bad?
Any ideas where to start troubleshooting?
Last edited by ozzy25; August 9th, 2010 at 11:23 PM.
August 11th, 2010, 06:18 PM
I replaced the thermostat and now the heater works again. Still nothing on the a/c side. The fuse blows when the fan switch is ON.
August 14th, 2010, 03:40 PM
Ok. Now i've fixed the fuse issue and can turn on the fan manually without blowing a fuse (wrong wire to ground). Heater works. The wiring on the furnace circuit board was wired different from the wiring diagram (fixed). This is a used unit which was installed 5 years ago and working until recently.
When i switch the a/c on, the outside unit fan spins, but the blower on the furnace doesn't start. Any ideas?
August 14th, 2010, 09:01 PM
I'm asked MorePower7701 if he could assist you ozzy.
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August 18th, 2010, 10:12 PM
August 22nd, 2010, 08:01 PM
There should be a switch on the thermostat for Gas/Electric? Pull the cover off the stat, there should be eather a switch or a pin that is jumped out for electric or gas.
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