Question about Goodman GMS90703BXA Heater

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Goodman GMS90703BXA Heater/AC - 3 Amps Fuse blows

It were working perfectly well for about 6 months. Last winter, suddently stop. I called a technitian, he replace the 3 Amps fuse and the heating start working again. Later, same day, I try to turn on the fan, and the 3 Amps fuse, blow again. Can some one help me with this problems? Thanks.

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Re: Goodman GMS90703BXA Heater/AC - 3 Amps Fuse blows

It is a problem on your low voltage side. I had the same issue and found that my wire going to my outside condeser had been snagged on a wire hanger in my basement and was shorting out the system. I went a head and replaced the entire wire from my outside unit to my indoor and haven't had an issue since. So my advice is go to HD or Lowes and purchase some 14 gauge wire and replace the low voltage wire. If that doesn't work, then replace the thermistat wire, and thermistat. Great time to upgrate to a energy efficient thermastat.

Posted on Mar 18, 2009

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Re: Goodman GMS90703BXA Heater/AC - 3 Amps Fuse blows

This fuse is used on the low voltage side of the furnace. All 24 volt controls operate thru it. You may have a short in your thermostst, thermostat wire or even a bad transformer. After replacing the fuse, inspect the wiring in the cabinet as well as the wire heading toward the thermostat for damage. If you find none, check the thermostat for loose wires or contacts. If all else fails, jump out R and W with a small jumper temporarly at the furnace and see if the unit runs. You will have to tape the door switch closed to run it with the panel off. Remember, this will keep the furnace running 100% of the time until you disconnect the jumpers. Not a solution, just a test! If it runs flawless, you have a bad thermostat or wire. Diagnosing a transformer is for a technician.

Posted on Sep 18, 2007

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Re: Goodman GMS90703BXA Heater/AC - 3 Amps Fuse blows


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