What It Means
- OA DIFF PRESS SENSOR ERROR
Lennox Unit controller
Lennox Error Code 149
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 149
Check outdoor air damper differential pressure sensor and wiring.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
OA DIFF PRESS SENSOR ERROR
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.
