Goodman AC & Heat Pump Error Codes: Full List & Meanings

Every Goodman ac & heat pump error code in the Goodman GSXC7 installation instructions, unitary diagnostic codes, as published by Alpine Home Air (manual copy), with its meaning. This list covers gsxc7 variable-speed air conditioners (7-segment diagnostic display). Codes vary by model, so confirm in your owner's manual. Support: Goodman dealer or Goodman customer support (goodmanmfg.com).

Codes by system

Venting / airflow

Power supply

All Goodman ac & heat pump error codes

Codes marked "Reset only" or "Service" have no separate page because the manufacturer publishes no owner fix beyond a reset or a service call.

Code	Meaning	System	Owner action
A2	Outdoor air temperature sensor fault: the sensor is shorted, open, disconnected or out of range.	Sensors	Service
A3	Outdoor coil temperature sensor fault: the sensor is shorted, open, disconnected or out of range. A heat pump may fail to heat.	Sensors	Service
E5	Open fuse: a short in the low-voltage wiring has blown the control's fuse, and the system fails to operate.	Power supply	Service
EE	Internal fault: board mis-operation; the manual lists welded compressor relay contacts as the cause.	Control / electronics	Service
b0	The indoor circulator blower motor is not running when it should be (communicating ComfortBridge systems).	Motor / drive	Service
b9	Low indoor airflow: airflow is lower than demanded, so the system runs at reduced performance or stays on low stage. Listed causes include an indoor blower problem, blocked filters, restrictive or undersized ductwork, or mismatched indoor and outdoor units.	Venting / airflow	Owner checks
d0	Data not yet on the communicating network (ComfortBridge).	Control / electronics	Service
d1	Invalid data on the communicating network.	Control / electronics	Service
d2	System mismatch: the outdoor unit requires more airflow than the indoor unit can deliver, or shared data is incompatible or missing.	Control / electronics	Service
d3	Configuration error with the shared data sent to the control.	Control / electronics	Service
d4	Invalid memory card data.	Control / electronics	Service
01	Low side fault or low pressure switch open. Listed causes: low refrigerant charge, a liquid-line restriction, an indoor blower motor failure or the thermostat set extremely low. Shown as L1 when the control locks out. Also: L1	Heating	Service
02	High side fault or high pressure switch open. Listed causes: a blocked condenser (outdoor) coil or the outdoor fan not running. Shown as L2 when the control locks out. Also: L2	Venting / airflow	Owner checks
03	Short cycling: run time for the last four cycles was too short. Listed causes: intermittent thermostat demand or a faulty compressor relay.	Control / electronics	Service
04	Locked rotor: the compressor did not start. Listed causes: seized compressor bearings, a failed run capacitor or its wiring, or low line voltage.	Motor / drive	Service
05	Open circuit: power is disconnected, the compressor protector has failed, or the compressor is not wired properly to the control.	Power supply	Owner checks
06	Open start circuit: the compressor start winding is open, the run capacitor or its wiring has failed, or the compressor is miswired. Shown as L6 when locked out. Also: L6	Motor / drive	Service
07	Open run circuit in the compressor. Shown as L7 when locked out. Also: L7	Motor / drive	Service
L8	Low line voltage: the control detects supply voltage below the rating-plate range.	Power supply	Owner checks
H8	High line voltage: the control detects supply voltage above the rating-plate range.	Power supply	Service

Symptoms

Sources

Alpine Home Air (manual copy): Goodman GSXC7 installation instructions, unitary diagnostic codes (third-party copy of manufacturer service data)

Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with Goodman.