What It Means
- INVERTER MINOR
Lennox Unit controller
Lennox Error Code 187
Unit controller
Causes & actions from Lennox
How it shows
- M4 alarm code: 187
• Alarming Value = Inverter error code • Possible alarming values for Alarm 187 are: > 12 - High Comp Current > 13 - High Heat sink temperature > 14 - High PFC input current • If the alarm continues after outdoor conditions have moderated, check the fan, charge and coil. Alarm 187 will automatically clear when minimum off time expires. • Refer to trouble shooting guide in service manual for more information.
Applicable models & manual sources
- MODEL L - M4 UNIT CONTROLLER
INVERTER MINOR
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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