What It Means
Compressor locked rotor hard lockout.
Rheem AC & Heat Pump
Rheem AC & Heat Pump Error Code L4
Troubleshooting guide for the Rheem AC & Heat Pump system fault L4.
Possible Causes
- Seized compressor motor.
- Defective run or start capacitor.
- Low line voltage under load.
- Failed start relay or liquid slugging.
Not sure which one it is — or if it's none of these? Try ACLogics today.
Disclaimer: This information is for general reference. Error codes can vary by model and production year. Always refer to your machine's specific manual and the information printed on the unit itself.
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Full Diagnosis
Locked rotor lockout.
All Recorded Causes
Repeated compressor protector trips with very short run time. Possible seized compressor, bad run/start capacitor, low line voltage, excessive refrigerant in compressor, or failed start components. Manual reset may be required.
Verify Before Replacing Parts
- Confirm the exact Rheem model family and ac and heat pump context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since repeated compressor protector trips with very short run time.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm possible seized compressor, bad run/start capacitor, low line voltage, excessive refrigera….
- After the correction, run the system long enough to confirm the ac and heat pump fault does not return under normal load.
Not sure which system this Rheem code is on?
ACLogics has guided diagnostics for 57 Rheem fault codes and asks the right questions to narrow it down.
