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This thread is my exact problem.

Why does my Goodman a/c blower motor randomly not work?

I have changed out the run capacitor, thr Ignition board, Furnace Vent Air Pressure Switch, transformer, and Condenser Contactor.

The blower motor works perfectly fine during the day. Quits working around 11pm. Using Ecobee Smart thermostat. Tried turning the fan on manually by bypassing the thermostat and the fan doesn't turn on. 24v at the thermostat wires as well.

I've had 2 HVAC companies come out and they can't find anything wrong because it works great during normal hours. Im about to just give up and run space heaters all winter or run the heat to 85 before 11pm and try to get through the night without more heat. It really sucks when it's hot here in the south. No AC or air circulation all night.

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  • Do you still have the old thermostat, the one before you got the Ecobee? Sounds like a hidden program in the smart thermostat. If you've got the old one, switch it out and see if the problem 's still there.
    – JACK
    Commented Oct 7, 2022 at 23:48
  • Since it is a Ecobee Smart thermostat, someone has a setting on they phone to turn it off at 11PM
    – Traveler
    Commented Oct 8, 2022 at 0:21
  • I've tried with the old thermostat and it does the same thing. It's not exactly 11pm every night but its around that time. Sometimes midnight sometimes 10pm. I just know that If I don't set the thermostat to OFF it will kick on the AC when its warm and the unit outside runs but freezes up completely until I turn it off. But the blower fan wont turn on. Same goes for the heat, except the furnace will notice it overheating due the blower not moving the hot air and it shuts off.
    – Thursday
    Commented Oct 8, 2022 at 4:42
  • Again, I can bypass the thermostat and get the blower motor to run during the day by touching the corresponding wires together but if I try it at night when I have this issue the blower will never turn on. I've eliminated the thermostat as the problem as well as the wiring because 24v are showing on them.
    – Thursday
    Commented Oct 8, 2022 at 4:44
  • 1
    Can you post the wiring diagram of your unit please? Commented Oct 8, 2022 at 4:59

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