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PCA1

PCA1 — Condensation protection of refrigerant pipe

Lennox · Air Conditioning

What does PCA1 mean?

The system has detected condensation on the refrigerant pipes, indicating potential issues like insufficient insulation or improper operation.

Common Causes

  • Insufficient insulation on refrigerant pipes
  • High humidity combined with system operation
  • Refrigerant leak causing pressure drop and condensation
  • Improper system charge

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the insulation on the refrigerant pipes to ensure it is intact and properly installed.

  2. 2

    Ensure the system is operating within normal parameters.

  3. 3

    If condensation is excessive or persistent, a technician should inspect the refrigerant charge and system operation.

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
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