What It Means
- Unit controller is transmitting
Lennox Unit controller
Lennox Error Code TX (yellow) Flickering ON
Unit controller
Causes & actions from Lennox
How it shows
- m4 tx yellow: TX (yellow) Flickering ON
This manual entry does not list further causes or actions.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
Unit controller is transmitting
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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