What It Means
- VFD SHUTDOWN
Lennox Unit controller
Lennox Error Code 129
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 129
Indoor blower VFD fault detected. The CORE Control System will start monitoring the motor status ten seconds after blower command is sent. The CORE Unit Controller will stop unit operation if fault conditions are detected. Check belt and for blower overload. Fix source of fault and cycle power to the RTU.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
VFD SHUTDOWN
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.
