What It Means
- NETWORK SENSOR
Lennox Unit controller
Lennox Error Code 73
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 73
Check with integrator for refresh rate, network status lights and wiring.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
NETWORK SENSOR
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.
