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H42

H42 — Compressor low pressure abnormality

Panasonic · Air Conditioning

What does H42 mean?

This indicates an abnormality in compressor low pressure.

Common Causes

  • Outdoor pipe temperature sensor issue
  • Clogged expansion valve or strainer
  • Insufficient refrigerant
  • Outdoor PCB fault
  • Compressor fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the outdoor pipe temperature sensor.

  2. 2

    Inspect the expansion valve and strainer for blockages.

  3. 3

    Verify refrigerant levels.

  4. 4

    Inspect the outdoor PCB.

  5. 5

    Check the compressor.

Browse all codes in this manual (53)
Verified technical data. Last updated: April 2026

Related Faults

Error code on Timer display LCDError code on Timer display LCD - Specific fault identifiedF12F12 - Pressure switch activateF14F14 - Outdoor compressor abnormal revolution
Source: Panasonic Air Conditioning
Open Manual (Page 162)Search more codes in this manual