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189

Alarm 189 - Inverter Fatal Alarm

Lennox · PRODIGY 2.0 Unit Controller

What does 189 mean?

A critical inverter error has occurred, potentially due to issues like peak DC current, maximum current lockout, low/high DC link voltage, locked rotor, or compressor over current. This requires a manual reset.

Common Causes

  • Inverter error code 21, 22, 23, 26, 28, 29, 61, 62, or 75 detected

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Manually reset the alarm.

  2. 2

    Refer to the service manual's troubleshooting guide for detailed information.

Browse all codes in this manual (56)
Verified technical data. Last updated: April 2026

Related Faults

12Alarm 12 - High Pressure Switch S414Alarm 14 - High Pressure Switch S716Alarm 16 - High Pressure Switch S28
Source: Lennox PRODIGY 2.0 Unit Controller
Open Manual (Page 139)Search more codes in this manual