Lennox Unit controller

Lennox Error Code 191

Unit controller

What It Means

  • INVERTER VOLTAGE MISMATCH

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
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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