Question about Goodman GMS90703BXA Heater

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Gas furnace stopped; Thermostat to OFF;then ON after 5hrs-worked?

- Cold night for Dallas - in the 20's.
- Inefficient builder-grade, 12-yr old gas furnace was working hard (probably only 10 seer when installed new).
- Only Info I could find on side of the furnace/AC unit in attic:
Model: CD3CXA060000
S/N: S2495A00610
Efficiency: 80 AFUE
- Thermostat, Honeywell Chromatherm III, was set to 68 - the usual heat setting.
- At about 2:30AM the furnace cycled on like normal but then turned off very quickly without the normal "click" from the thermostat (Weird how that woke me up)
- Turned the thermostat OFF
- Waited 2hrs
- Turned thermostat ON (heat mode setting we use is "EM HT" so it does not use the heat pump mode).
- Lights on thermostat came on and heard the click like normal, but the furnace did not come on.
- Turned thermostat OFF again.
- Waited another 3hrs.
- Turned thermostat ON to EM HT mode.
- Thermostat again seemed to perform as usual except this time the furnace actually kicked on.
- Any idea what the problem is/was? What are my options? Can/Should I fix it (I have a mechanical mind, but I am not a trained technician) or should I call in a technician?

Thanks for any thoughts, suggestions, advice and/or instructions you can share!

A cold family of 6 in Dallas

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  • colel Mar 05, 2009

    Thank you so much for the detailed instructions and suggestions! I will do as you suggest.

    A cold family of 6 in Dallas



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You have a carrier or bryant AC Coil model number and the sn says 1995 and its 5 tons and if you actually have a heat pump with the gas furnace you have what we call in the business a dual fule heatpump setup. There are a number of items that could be causing your problem. I would recomend that you first look for the relay box discribed below and if you have that put the wires at your furnace (R &W) together with nothing else on them. If it lites then the problem could be anywhere, thermostat, wiring, the control box which has about 4 to 6 relays. If it dosn't lite the furnace is where your problem is or at least one of your problems is and start there. remove anyother wires on R&W before reapplying power. Also if you have the control box below it will have its own 24v control transformer but your going around that with the test I mentiond here. Oh yes and if it hasnt been modified you'll have to keep the solid door on it to apply power to the furnace.

There are a multitude of items it could be but I believe your age furnace has an auxiliary sensor - relay assembly it is a box about 18 inches long X 6 inches square. has about 10 terminals on it. And it will look like a birds nest with all the wires going and comming out. Id have to suggest you call someone and here's what Id do if I were you. If they say they aren't sure but think its in the relay assembly for the dual fuel control ask them to call carrier or Bryant and request they talk to a service trained expert there or recomend someone. You can do this instead of paying for 2 people. Just ask them if they know about Bryant or Carrier Heatpump dual fuel setup before you tell them to come out.

The newer dual fuel thermostats around $300 - $400 plus an out door sensor about $30 will get you fixed for parts. NO more relay box needed just the out door sensor and the compatable thermostat. if this is where the problem leads. The thermostat cost will depend on if you want the program feature. If someone is home all day Id suggest you probably don't need this feature.

This should get you headed in the right direction. If it helps you please grasde me accordingly, and GOOD LUCK!

Posted on Mar 05, 2009


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