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H64

H64 - Refrigerant high pressure abnormality

Panasonic · Aquarea Heat Pumps

What does H64 mean?

The outdoor high pressure sensor has detected an issue. The system will stop operation after 5 seconds of this condition.

Common Causes

  • Outdoor high pressure sensor is defective or disconnected
  • Outdoor PCB fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the outdoor high pressure sensor for proper connection and function.

  2. 2

    Inspect the outdoor PCB for any visible damage.

  3. 3

    Contact a qualified installer or service technician for diagnosis and repair.

Browse all codes in this manual (69)
Verified technical data. Last updated: April 2026

Related Faults

2 beeps then pause2 beeps then pause - Overfill warning3 red flashes3 red flashes - Communication errorError Code DisplayError Code Display - Abnormality detected
Source: Panasonic Aquarea Heat Pumps
Open Manual (Page 76)Search more codes in this manual