Circulator blower motor is not running when it should be. The air conditioner or heat pump fails to operate, and the display shows b0.
Goodman b0 on the PCBHR104 chart means the circulator blower motor is not running when it should be. The air conditioner or heat pump fails to operate. Causes are an indoor blower motor problem and a communications error between the indoor and outdoor units. The actions are the indoor blower motor, its wiring, the indoor control, and repairing or replacing faulty wiring or the motor. It is not b9, which is airflow lower than demanded while the system still runs at reduced performance. The display uses a lowercase b.
Likely causes
- Indoor blower motor problem
- Communications error between the indoor and outdoor units
Safe checks for b0
- Confirm the display reads b0, with a lowercase b, not b9. b9 is low airflow while the system is still running
- Techniciancheck the indoor blower motor and its wiring, the indoor unit control, and repair or replace faulty wiring, the motor, or the control. Turn power off first
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. A blower that is not running is not fixed by changing the filter.
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