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H99

H99 — Indoor heat exchanger freeze prevention

Panasonic · Air Conditioning

What does H99 mean?

This code indicates that the indoor heat exchanger freeze prevention system has activated.

Common Causes

  • Indoor heat exchanger issue
  • Refrigerant shortage

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the indoor heat exchanger.

  2. 2

    Check for refrigerant shortage.

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