Model #GMNT080-4B GOODMAN Furnace/Heater, Gas

  • Wrapper Assembly
    3 Results
  • Blower Assembly
    3 Results
  • Heat Exchanger Assembly
    3 Results
  • Burner Box Assembly
    3 Results
  • Misc. Components/drain Kit Assembly
    3 Results
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Question and Answers

Q:

no hot air coming from goodman furnace gmnt080-4b GMNT0804B Goodman Gas furnace

Q:

Is heat exchanger replaceable if cracked? GMNT080-4B Goodman Gas furnace

A:

Good morning... I can fully understand your concern regarding this issue. I did locate a link that will discuss this situation in greater detail. I will let an expert respond to your question on the exchanger being cracked. Though this link discusses a different model number, the mechanics are likely going to be very similar. Keep in mind that an expert will be responding within the next two business days if not sooner and will likely offer you more information and instruction. I hope this link will help guide you as to what might be wrong with your furnace and have a nice day.

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Henry -
March 01, 2013
A:

Yes the heat exchanger is replaceable and is still available from the manufacturer.  The heat exchanger however needs to be diagnosed and replaced by a qualified technician.  If there is any feeling that the heat exchanger is cracked, the furnace should be shut down and disabled until it can be properly diagnosed and repaired.

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Andrew D -
Sears Technician
March 01, 2013
A:

I have a Goodman Model # GMNT080-4 furnace that is about 11-12 years old. My problem: The blower motor will not turn, i.e., it might start and continue to run after a sluggish, slow start, or it does not start at all. When it does start, the furnace and motor function ok. The part number for the blower motor is GMCB1340020S. ? - Does the motor need to be replaced? ? - Or, does the capacitor need to be replaced. If so, How do I discharge the capacitor before remove, replace? ? - Does both the capacitor and the motor need to be replaced? Your help is appreciated. Larry

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Larry -
December 05, 2013
A:

Hi Larry and thank you for your question. What your furnace has is a simple 1/2hp direct drive motor and it should start and stop without any sluggishness. It does sound like the capacitor is weak. It doesn't mean that the motor doesn't have a winding that's beginning to go bad, but it's a little unlikely. You would be correct that the first step, and most cost effective would be to replace the capacitor. When replacing the capacitor, the first thing you need to do is to disconnect the power to the furnace at the breaker and or unplug it from the outlet if that is how your furnace is setup. Once power has been removed, remove the blower access panel and get an insulated screwdriver. If there is a leather booth covering the top of the capacitor, carefully remove the boot and then use the metal end of the screwdriver to short across the two capacitor terminals. This will dissipate the stored energy inside of the capacitor. After that, it is safe to remove the wires to the capacitor, remove and replace the capacitor with a new one. Reconnect the wires and the boot, reinstall the door and run the furnace. If you're still having problems then the motor start winding is going bad. Typically when it comes to direct drive motors, either they run or they don't run. Because the motor eventually starts itself to full speed, that tells me it's the capacitor. Thanks and good luck! Post back here with any other questions you might have and thank you for using Manage My Life.

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Andrew D -
Sears Technician
December 06, 2013
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