What It Means
- INVERTER VOLTAGE MISMATCH
Lennox Unit controller
Lennox Error Code 191
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 191
The unit controller will disable compressor operation. Replace with correct inverter part.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
INVERTER VOLTAGE MISMATCH
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.
