Goodman Heat Pump Error Code b6

Error code b6 on a Goodman heat pump signals an over/under voltage trip or an over temperature trip. The control board has detected that either the electrical supply voltage was outside safe operating limits, or internal temperatures exceeded a safe threshold. The system shuts down automatically to protect components like the compressor and control board from damage.

No. The b6 code means the system has already shut itself down as a protective measure. Attempting to force the unit to run with an unresolved voltage or over temperature condition can cause permanent damage to the compressor or control board. Do not bypass the shutdown and have the system diagnosed before resuming normal operation.

Repair costs vary widely depending on the cause. Cleaning a coil or replacing a filter is minimal in cost, while replacing a run capacitor typically runs in the range of $150 to $350 including labor. A failed fan motor can cost between $300 and $600 or more depending on the model. If the compressor has been damaged by repeated voltage or temperature events, costs can exceed $1,000 to $2,500 or more.

Some causes of b6, such as a dirty air filter or a blocked outdoor unit, can be addressed by a homeowner. However, diagnosing voltage issues requires a multimeter and working near high-voltage components, which carries serious safety risks. If the cause involves electrical connections, capacitors, or refrigerant, a licensed HVAC technician should perform the repair.

Resetting the unit by cycling power at the disconnect or breaker may temporarily clear the b6 code, but if the underlying cause, such as low voltage or restricted airflow, is still present, the code will return. A reset is useful for confirming whether the issue is intermittent, but it does not fix the root problem.