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H64

H64 — Refrigerant high pressure abnormality

Panasonic · Air Conditioning

What does H64 mean?

This error signifies a high pressure abnormality in the refrigerant. It is reported if the condition persists for 5 seconds.

Common Causes

  • Outdoor high pressure sensor is defective or disconnected

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the outdoor high pressure sensor is defective.

  2. 2

    Ensure the outdoor high pressure sensor is properly connected.

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

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Source: Panasonic Air Conditioning
Open Manual (Page 162)Search more codes in this manual