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P0

P0 — Inverter module IPM error

Lennox · Air Conditioning

What does P0 mean?

The Intelligent Power Module (IPM) in the inverter has reported an error. The IPM is crucial for controlling the compressor's speed.

Common Causes

  • IPM failure
  • Overheating of the IPM
  • Electrical issues within the inverter system

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure adequate ventilation around the outdoor unit to prevent overheating.

  2. 2

    Check electrical connections to the IPM.

  3. 3

    If the error persists, the IPM may require replacement by a qualified technician.

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