Locked rotor: the compressor is not turning properly.
Goodman 04 is a locked rotor: the compressor is not turning properly. It is not short cycling (03) and it is not a pressure-switch code. Causes are a compressor failure or a bearing problem, a failed run capacitor, and low line voltage or a wiring problem. Both steps are for a technician: confirm that high voltage to the system is within specification, check the run capacitor and replace it if it is bad, check the wiring, and check compressor operation. The page's advice is to stop resetting the breaker, because a locked rotor stresses the compressor. Code 04 has no coil-cleaning step.
Likely causes
- Compressor failure or bearing problem
- Failed run capacitor
- Low line voltage or wiring problem
Safe checks for 04
- Technicianconfirm high voltage to the system is within specification, check the run capacitor and replace it if bad, and check wiring
- Techniciancheck compressor operation and repair or replace as needed
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician: do not keep resetting the breaker, since a locked rotor stresses the compressor.
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Parts & tools for this fix
Taken from this code's causes or steps. A search link opens Amazon results and does not confirm a fit. Check the model number in the manual.
Run capacitor (furnace blower and AC): guide
In this code: Failed run capacitor
This one is for a technician to test or replace, so we only explain it and do not link to buy it.
Multimeter for appliance and HVAC diagnosis: guide
In this code: Low line voltage or wiring problem
This one is for a technician to test or replace, so we only explain it and do not link to buy it.