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P2

P2 — High temperature sensed at compressor top

Lennox · Air Conditioning

What does P2 mean?

The compressor's top temperature has exceeded safe operating limits. This can occur due to operational strain or inadequate cooling.

Common Causes

  • Overheating of the compressor
  • Low refrigerant levels
  • Blocked airflow to the outdoor unit
  • Malfunctioning fan

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit's vents are clear of obstructions.

  2. 2

    Check if the outdoor fan is operating correctly.

  3. 3

    Verify refrigerant levels (this typically requires a technician).

  4. 4

    Allow the unit to cool down before restarting.

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 6)Search more codes in this manual