What It Means
Low pressure switch is open during cooling or heat pump operation.
Lennox All Systems
Lennox Error Code E223
Troubleshooting guide for the Lennox system fault E223.
Possible Causes
- Low refrigerant.
- Bad pressure switch.
- Restricted airflow.
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
Low Pressure Switch Open. The low pressure switch is open (Cooling/Heat Pump).
All Recorded Causes
Low refrigerant, bad switch, restricted airflow.
Verify Before Replacing Parts
- Confirm the exact Lennox model family and e-codes context before acting on a generic code description.
- Verify airflow first, then confirm operating pressures and temperature relationship before adjusting charge, since low refrigerant, bad switch, restricted airflow.
- Look for restrictions, iced coils, or dirty heat-transfer surfaces that can mimic a charge problem, and separately confirm the next candidate on the list.
- After the correction, run the system long enough to confirm the e-codes fault does not return under normal load.
Not sure which system this Lennox code is on?
ACLogics has guided diagnostics for 16 Lennox fault codes and asks the right questions to narrow it down.
