What It Means
Hard lockout due to repeated high pressure switch trips.
Rheem AC & Heat Pump
Rheem AC & Heat Pump Error Code L29
Troubleshooting guide for the Rheem AC & Heat Pump system fault L29.
Possible Causes
- Dirty outdoor coil or dead outdoor fan.
- Refrigerant overcharge.
- Liquid line restriction.
- Indoor airflow restriction in heat mode.
- Faulty high pressure switch.
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
High pressure control lockout / active protection.
All Recorded Causes
High pressure control tripped repeatedly during the same call. Check outdoor fan, condenser coil, refrigerant charge, liquid-line restriction, indoor airflow in heating mode, and high-pressure switch. 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 high pressure control tripped repeatedly during the same call.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm check outdoor fan, condenser coil, refrigerant charge, liquid-line restriction, indoor air….
- 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.
