Thermostat shows E231 indicating remote humidity sensor fault (if a separate sensor is installed).

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Open or shorted wiring to Lennox remote humidity sensor, Failed remote humidity sensor element, Incorrect sensor type connected, Misconfiguration of humidity sensor in thermostat setup

How to Fix / Troubleshooting

Safety warning: De-energize the thermostat circuit before working on sensor wiring.

1. Verify sensor configuration:
- In the installer menu, confirm that a remote humidity sensor is actually enabled only if one is installed.
2. Inspect wiring and connections:
- Check the remote humidity sensor terminals at the thermostat or zone panel.
- Ensure wires are not shorted together or broken.
3. Replace sensor if defective:
- If wiring is intact and E231 remains, install a new Lennox-compatible remote humidity sensor.

Repair Difficulty

Medium 3/5

Required Part

Lennox Remote Humidity Sensor

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