What It Means
- CRITICAL LOSS OF EVAPORATOR AIRFLOW
Lennox Unit controller
Lennox Error Code 199
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 199
Critical Loss of Evaporator Airflow.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
CRITICAL LOSS OF EVAPORATOR AIRFLOW
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.
What should you check next?
Continue in ACLogics with guided diagnosis for your equipment and symptoms.
