Question about Goodman GMS90703BXA Heater

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Goodman a/c works, heater will work fine then fan will stop

I had this Goodman heat pump installed almost 3 years ago and no one has been able to fix it. In the summer, the a/c works perfectly. When the weather turns cold (this week in South Carolina), the heater will work until the house heats up close to the thermostat setting (72 degrees, although I have tried anywhere from 65 to 78 degrees, hoping that is the problem). Then the inside air will stop and I can hear the (I assume) compressor humming loudly outside. This will continue for up to half an hour, at which point I turn the thermostat to off. Also, when I turn the fan to on, it doesn't come on. I have also learned that, when the above problem happens, I can turn the fan to on and then immediately back to auto, and I'll get heat blowing inside the house again. Help! I'm a single mother and can't afford to continue supporting my local HVAC repairmen.

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  • njs7227 Nov 24, 2008

    I'll actually try that but, as for keeping the fan in the "On" position, the blower doesn't work in the "On" position, only on "Auto". I'm replacing the thermostat (which the HVAC repairman didn't replace when the unit was installed), because the fan not coming on suggests a thermostat problem to me. If that doesn't help, I'll move on to replacing the circuit board. Thanks for your help.

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You have a circuit board acting up. Try keeping the fan in the "On" position. It will keep the blower on all the time but it may work. There is a built-in delay not allowing the unit to come on after you reset it with the thermostat, wait three minutes or so to see if it comes back on. I still suspect a bad circuit board.

Posted on Nov 21, 2008

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