Carrier 58STA/58STX No Heat
Tried to use the furnace for the first time this season and our furnace will not start (North Texas and damn good insulation). I am leaning towards the control board, but I will detail my troubleshooting and would appreciate any additional advice. The thermostat calls for heat, but I get a 31 error code. My inducer motor will not come on.
I confirmed 120VAC and 24VAC to the board and when I initiate self test, the blower motor comes on, but the inducer motor does not. I have a good common ground across the unit.
I checked all limit and roll out switches and I have 0 ohms across all switches. I am able to actuate the pressure switch and observe resistance drop to 0.
I do not have 120VAC to the inducer motor and wiring between the motor and is good. I shorted R and W on the board and still do not see 120 at the board or at the motor.
Anybody have any other ideas? The control board is a HK42FZ013. Thanks