Goodman Heat Pump Error Code 04

Error code 04 on a Goodman heat pump indicates a locked rotor fault, meaning the compressor failed to start or spin up properly. The control board detects abnormally high current during a start attempt and shuts down the system to prevent damage. The cause is typically a failed run capacitor, low incoming voltage, faulty capacitor wiring, or seized compressor bearings.

No, you should not continue attempting to operate the system with an active locked rotor fault. Repeated failed start attempts can overheat the compressor motor windings, cause the internal overload protector to fail, and potentially damage the contactor or other electrical components. Address the fault before resuming normal operation.

Resetting the system by cycling power may temporarily clear the fault code and allow another start attempt, but it will not resolve the underlying problem. If the root cause such as a failed capacitor or seized compressor has not been corrected, the unit will fault again, often immediately. Repeated reset attempts without diagnosis can accelerate damage to the compressor and electrical components.

Some causes of error code 04 are within reach of an experienced DIYer. Checking line voltage at the disconnect and inspecting capacitor wiring connections are straightforward steps. However, testing and replacing a run capacitor involves working near components that can hold a dangerous electrical charge even when power is off, and a seized compressor requires professional replacement. Use extreme caution or call a licensed technician if you are not comfortable working with high-voltage components.

Repair cost depends heavily on the root cause. A run capacitor replacement is typically a lower-cost repair, often ranging from $80 to $250 including labor. If low line voltage is caused by a utility or wiring issue, electrical service work may add additional cost. A seized compressor is the most expensive outcome, with compressor replacement on a heat pump generally ranging from $1,200 to $2,800 or more depending on the unit size and refrigerant type.