What It Means
- ECONOMIZING WHEN OANS
Lennox Unit controller
Lennox Error Code 151
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 151
This may be due to damper motor being blocked or stuck open and therefore not closing.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
ECONOMIZING WHEN OANS
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.
