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H12

H12 - Indoor and outdoor capacity mismatch

Panasonic · Aquarea Heat Pumps

What does H12 mean?

The system has detected that the indoor and outdoor units are not correctly matched for capacity. This can lead to inefficient operation or system failure.

Common Causes

  • Incorrect indoor/outdoor unit combination
  • Indoor/outdoor connection wire issue
  • Indoor/outdoor PCB fault

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the specification and combination table in the catalogue for correct unit matching.

  2. 2

    Verify the indoor and outdoor connection wires are securely connected.

  3. 3

    Inspect the indoor and outdoor PCBs for any visible damage or loose connections.

  4. 4

    Contact a qualified installer or service technician if the issue 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