Question about Goodman GMS90703BXA Heater

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It will only cycle once and then it shuts off.. i have to turn off and then back on through the thermostat to get it it through another cycle , the system is three years old. i have tried two other thermostats

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  • corchado41 Sep 12, 2009

    Thank you for responding. I tried what you suggested and you are right. It blinked 4 times and the code says "open high limit". Any idea as to what that means?? I do notice that the initial cycle seems long.

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Your furnace has a diagnostic light in the unit. Look for a small see-thru window either on the top panel or the bottom panel. Look for a blinking light. Record the number of blinks. Now remove the bottom panel and look at the wiring diagram. There will be a error code list explaining what the blinks represent. If you open the panel prior to looking thru the window, you will erase the code. Changing the thermostat is not the solution. Good Luck.

Posted on Sep 09, 2009

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  • Chandler Ede
    Chandler Ede Sep 12, 2009

    An open limit switch could be the little thermo-disc found over the flame box. It will have two wires going to it. If you connect the two wires together, the unit should fire. This procedure is to just test the thermo-disc, not to run it this way. You may have others in your furnace as well. Follow the wiring diagram to find the others. Good Luck! Glad to help.

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Check your venting and lint basket. Check blower for lint build up and blower wheel obstruction., test by trying to turn the wheel manually by hand (should be easy) May have to remove cabinet or front/back plate to get to it)

Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective or has a short if its grounding out? Which in turns causes blown fuses or thermostats or overheating.

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Check the thermal cut off, the cycling and the hi limit thermostats.
For continuity or OHMS. If no ohms or resistance they need replacement.

In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum

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Next check the heating element itself with a meter for continuity OHMS CLOSED CIRCUIT. If not its defective or has a short if its grounding out? Which in turns causes blown fuses or thermostats or overheating.

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For continuity or OHMS. If no ohms or resistance they need replacement.

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