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H99

H99 - Indoor heat exchanger freeze prevention

Panasonic · Aquarea Heat Pumps

What does H99 mean?

The system has detected a risk of the indoor heat exchanger freezing. The system may stop operation to prevent damage.

Common Causes

  • Indoor heat exchanger issue
  • Refrigerant shortage

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the indoor heat exchanger is not blocked or dirty.

  2. 2

    Check refrigerant levels.

  3. 3

    Verify the unit is operating within its designed temperature range.

  4. 4

    Contact a qualified installer or service technician if the error persists.

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