Goodman Heat Pump Error Code b2

Error code B2 on a Goodman heat pump indicates a blower motor horsepower mismatch. The control board has detected that the installed blower motor's HP rating does not match the expected configuration for the unit. This fault is common after a motor replacement where an incorrect part was used. The system flags this code to prevent performance issues or motor damage caused by running an incompatible component.

Running the system with a B2 fault is not recommended. A horsepower mismatch can cause the blower motor to operate outside its intended parameters, potentially leading to overheating, premature motor failure, or inadequate airflow throughout your home. It is best to shut the system down and have it inspected before continuing to operate it.

A reset may temporarily clear the B2 fault, but the code will return if the underlying cause has not been corrected. Because B2 is tied to a hardware mismatch between the motor and the control board, the fault is detected each time the system powers up and checks motor parameters. A permanent fix requires identifying and correcting the mismatch, not just resetting the unit.

If you are comfortable working with HVAC equipment, you can start by checking the blower motor nameplate to confirm its horsepower rating matches the unit's specifications. Inspecting wiring harness connections for damage or loose pins is also a reasonable DIY step. However, replacing a control board or ECM blower motor involves working near high-voltage components, so many homeowners prefer to have a certified technician handle those repairs.

Repair costs vary depending on the root cause. If the fix is simply replacing an incorrectly installed blower motor with the correct part, you might expect to pay anywhere from $200 to $600 including labor. If the control board is the source of the problem, board replacement typically ranges from $300 to $800 depending on the model. An accurate estimate requires a technician to diagnose the specific cause first.