What It Means
- INVERTER MAJOR
Lennox Unit controller
Lennox Error Code 188
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 188
• Alarming Value = Inverter error code • Possible alarming values for unit controller alarm 188 are: > 21 - Peak DC current > 22 - Maximum current reached lockout > 23 - DC Link low voltage > 26 - Locked Rotor > 28 - DC Link high voltage > 29 - Compressor over current > 61 - Low outdoor ambient inverter lockout > 62 - High Heat Sink Temperature lockout > 75 - Low Input Voltage • No action required. Compressor stops for the duration of the minimum run time. Unit shuts down after ten occurrences in one hour and Alarm 189 is initiated. Alarm 188 will automatically clear when inverter error clears. • Refer to trouble shooting guide in service manual for more information.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
INVERTER MAJOR
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.
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