Model #GMP075-3 GOODMAN Furnace/Heater, Gas

  • Wrapper/heat Exchanger Assembly
    3 Results
  • Burner/combustion Box
    3 Results
  • Blower/misc. Electrical/drain Trap
    3 Results
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Question and Answers

Q:

GMC Gas Furnance #GMP075-3: The fan blows continuously, with no heating or cooling. Thanks for a list parts to examine & test to diagnoise and repair.

A:

I'm sorry to hear that you are having some difficulties with your furnace. I did some research for you at Managemylife.com and found an expert answer to a similar question that may help until your expert can respond to your specific question. The link is attached below. If you do decide to schedule service and have a qualified technician help you, I have also attached a link to Searshomeservices.com. I hope these links provided assist you.

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Joseph P. -
October 18, 2011
A:

Thank you for your question. If the fan runs continuously, first check if the thermostat is set to auto or on. If it's set to on, the fan will run all the time and if the thermostat is set to auto, this could be a board problem. Locate the white, green and red wires from the thermostat and where they connect on the board. Disconnect power to the furnace and now remove the red wire from the board. Reconnect the power and if the fan continues to run, it will indicate the relay in the board has failed and the board will need to be replaced.

If the motor stops when the thermostat wire is removed, it will indicate a problem with the thermostat or the wires have shorted together somewhere, between the thermostat and the board. I hope this will help you. If you would like more assistance, reply to this thread and I will be glad to assist you further.

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Scott D -
Sears Technician
October 19, 2011
A:

I disconnected the thermostat and the blower comes on and then cycles off, as if it were being controlled by the thermostat. Very strange that it cycles even with the thermostat out of the circuit?

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George -
August 22, 2015
A:

This all started because I had to replace the run capacitor... maybe that's why the run cap failed?

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George -
August 22, 2015
A:

This all started because I had to replace the run capacitor... maybe that's why the run cap failed?

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George -
August 22, 2015
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Q:

Why does my furnace blower Runs normal for about 2 to 3mins max, then stop?

A:

Thank you for using Manage My Life.  I know how frustrating it can be when your HVAC system is malfunctioning.  Your furnace has a bad furnace control board is the most likely situation because of how you described how the blower runs in heat as opposed to air conditioning.

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Andrew D -
Sears Technician
August 12, 2013
Q:

How can I get the wiring diagram for my furnace control board? I need to how how to rewire it.

A:

The Managemylife web site is a good resource of information to find out what may be happening and what options are available to you. I'm sorry to hear about the difficulties finding this information. I did some research at Managemylife website and found this expert answer to a similar question that may help until your expert can respond. I have attached the link below so you can check it out.

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James -
June 29, 2013
A:

Thank you for your question. It's always nice to have the wiring diagram. I'm attaching the wiring diagram for the GMP furnace below and I hope it will help you. If you would like more assistance, reply to this thread and I will be glad to assist you further.

 

If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website: Sears Home Services.

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Scott D -
Sears Technician
July 01, 2013
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