Question about Goodman GMS90703BXA Heater

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Thermostat Goodman Furnace MBR1200AA-1. It has not got a air conditioner or heat pump, just heater coils. All of the electric is hooked up and my thermostat but nothing happens. My old thermostat is a 2 wire. Do I need a different thermostat and wire set up? If so what do I need to get.

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  • robmelissah Oct 22, 2008

    My problem is solved! My furnace needed a 24volt signal coming from the thermostat to my contacts on my heater coils in order for them to pull in. I went to Home Depot and got me a ritetemp programmable thermostat for the signal and ran a new 5 wire cord from it down to my furnace. Granted I only needed three wires to make it function, but I now have the rest when I do add on an air conditioner and heat pump. I was missing the loop for my heater relay in the third wire over my 2 wire set up I originally had. Once I hooked that up everything worked great. Thanks for your help and support.



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Are you saying no lights on the control board light up as well? If so, check the door switch, Emergency switch, breaker and lastly, the power to the furnace. If you can see a light but the system is not working, check for any error code (flashing) and look at the wiring diagram on the back of the service door. Also, there is a small fuse that you may want to inspect. If you do have a light on, jump out R and G on the control board and make sure you push in on the door safety switch. Let us know what you discover!

Posted on Oct 21, 2008

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