Goodman Heat Pump Error Code 01

Error code 01 on a Goodman heat pump indicates a low side fault, meaning the suction pressure in the refrigerant circuit has dropped too low and the low pressure switch has shut the compressor down. Common causes include low refrigerant charge, a restricted liquid line, indoor blower motor failure, or a thermostat set to an extremely low temperature. A technician should connect gauges to confirm suction pressure before proceeding with repairs.

No. Error code 01 causes the system to shut down the compressor specifically to prevent damage from low suction pressure. Attempting to override or repeatedly reset the system without fixing the underlying cause can damage the compressor, which is one of the most expensive components in the system. Leave the unit off until the fault is properly diagnosed and repaired.

Repair costs vary significantly depending on the root cause. Refrigerant leak detection and recharging typically ranges from $200 to $600 or more depending on refrigerant type and the amount needed. Replacing a filter drier may cost $150 to $400 in parts and labor. An indoor blower motor replacement can range from $300 to $700. A technician's diagnostic visit is usually an additional $75 to $150 on top of repair costs.

Some checks, such as confirming the thermostat setpoint is reasonable and verifying the indoor blower is running, can be done without special tools. However, diagnosing and correcting refrigerant charge or a liquid line restriction requires EPA Section 608 certification and gauge manifold equipment. Most repairs for this code should be handled by a licensed HVAC technician.

Resetting the unit by cycling power may temporarily clear the fault and allow the system to restart, but if the underlying cause is not corrected, the low pressure switch will trip again and the code will return. A reset does not fix a refrigerant leak, a restricted line, or a failed blower motor. Clearing the code is only useful as part of a diagnostic process after a repair has been made.