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PC00

PC00 — Inverter module (IPM) protection

Lennox · Air Conditioning

What does PC00 mean?

The system has activated protection for the Inverter module (IPM). This component is essential for controlling the compressor's speed and power delivery.

Common Causes

  • Overheating of the IPM
  • Electrical fault within the IPM
  • Voltage irregularities affecting the IPM

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure adequate airflow around the outdoor unit to prevent overheating.

  2. 2

    Check electrical connections associated with the IPM.

  3. 3

    Reset the unit by turning off power for 30 seconds and then restoring it.

  4. 4

    If the error persists, the IPM or related components may need professional replacement.

Browse all codes in this manual (57)
Verified technical data. Last updated: April 2026

Related Faults

E0E0 — Indoor unit EEPROM error (MMDB Indoor Units)E1E1 — Communication error between indoor and outdoor units (MMDB Indoor Units)E3E3 — Indoor fan speed error (MMDB Indoor Units)
Source: Lennox Air Conditioning
Open Manual (Page 7)Search more codes in this manual