What It Means
- WCS LOW BATTERY CRITICAL
Lennox Unit controller
Lennox Error Code 517
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 517
A paired wireless sensor has low battery - less than 2%
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
WCS LOW BATTERY CRITICAL
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.
