What It Means
- INDOOR ENTHALPY SENSOR
Lennox Unit controller
Lennox Error Code 92
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 92
If Enthalpy Sensor failure is detected, the system will disable ‘Free Cooling’ operation. NOTE: Valid Outdoor Enthalpy Sensor reading is required for both ‘ODE’ (Outdoor Enthalpy) and ‘ODE differential’ (Outdoor differential). Valid Indoor Enthalpy Sensor reading is required for ‘ODE differential’ (Outdoor differential). Check wiring and test A62 sensor using specified method in M4 application guide, section titled economizer checkout.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
INDOOR ENTHALPY SENSOR
MODEL L - M4 UNIT CONTROLLER, M4 Unit Controller
Disclaimer: This information is for general reference. Code wording and instructions vary by model. Always follow the service manual for your exact unit.
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