What It Means
- INVERTER COMMUNICATION ERROR
Lennox Unit controller
Lennox Error Code 190
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 190
Unable to communicate with inverter. The unit controller will disable compressor operation. Replace communication cable between inverter and CORE Unit Controller. If alarm continues, replace CORE Unit Controller or inverter.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
INVERTER COMMUNICATION ERROR
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.
