Goodman AC / heat pump error codes

Low pressure cutout: the low pressure switch tripped 3 times within the same thermostat call, so the compressor and outdoor fan are off.

High side fault: four consecutive compressor protector trips with average run time between trips of more than 1 minute and less than 15 minutes, with the low and high pressure switches closed.

Short cycling: the outdoor unit is cycling on and off too quickly.

Locked rotor: the compressor is not turning properly.

Open circuit. The compressor and outdoor fan have been off for more than 4 hours, and both pressure switches are closed.

Open start circuit. The compressor and outdoor fan are off, and both pressure switches are closed.

Open run circuit. The compressor and outdoor fan are off, and both pressure switches are closed.

No line voltage. The unit may appear to be operating normally, and the compressor protector may be open so the compressor and outdoor fan are off.

Low pilot voltage. The air conditioner or heat pump may appear to be operating normally. The chart's note says the control detects secondary voltage less than 18 VAC.

Outdoor air temperature sensor fault. The integrated control module shows A2. The air conditioner or heat pump may show only this code, with no separate symptom line on this row.

Outdoor coil temperature sensor fault. The chart says the heat pump fails to operate in heating mode, and the display shows A3.

Circulator blower motor is not running when it should be. The air conditioner or heat pump fails to operate, and the display shows b0.

Airflow is lower than demanded. The air conditioner or heat pump operates at reduced performance, or in low stage when high stage was expected. The display shows b9.

Data not yet on the network. The air conditioner or heat pump fails to operate.

Invalid data on the network. The air conditioner or heat pump fails to operate.

System mismatch: the outdoor and indoor units are not an acceptable combination, or the airflow trim settings are set to a prohibited value.

Configuration mismatch. The air conditioner or heat pump fails to operate.

Invalid shared data. The air conditioner or heat pump fails to operate. The chart says the code clears once data is loaded.

Open fuse: the low-voltage fuse on the control is blown.

Board misoperation: the manual lists welded compressor relay contacts as the error condition.

High line voltage: the unit may seem to run normally, but the compressor protector may be open (compressor and outdoor fan off).

Open start-circuit lockout. The open start circuit was detected 4 times, with a 5-minute delay between each detection. The compressor and outdoor fan are off.

Open run-circuit lockout. The open run circuit was detected 4 times, with a 5-minute delay between each detection. The compressor and outdoor fan are off.

Low line voltage: the supply voltage to the outdoor unit is below the specified range.

Compressor protector open. The compressor is off.