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PC02

PC02 — Top temperature protection of compressor

Lennox · Air Conditioning

What does PC02 mean?

The compressor's top temperature has exceeded its safe operating limit. This indicates potential overheating.

Common Causes

  • Insufficient cooling airflow to the compressor
  • Overheating due to high ambient temperatures
  • Low refrigerant charge
  • Compressor strain

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit's ventilation openings are clear of debris.

  2. 2

    Check that the outdoor fan is operating correctly.

  3. 3

    Allow the system to cool down before attempting to restart.

  4. 4

    Contact a technician if the issue is recurrent, as it may indicate refrigerant or internal compressor problems.

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