What It Means
- DAMPER STUCK CLOSED
Lennox Unit controller
Lennox Error Code 137
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 137
• The damper is not opening to the target percentage. Unit may be bringing in less than anticipated outdoor air. • Inspect damper and / or actuator for blockage. alarm is raised when damper actuator feedback exceeds 2v under target for 2 minutes. • Alarm will reset automatically when damper feedback falls to 1.8v within the target voltage.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
DAMPER STUCK CLOSED
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?
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