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H12

H12 — Indoor/Outdoor capacity unmatched

Panasonic · Air Conditioning

What does H12 mean?

This error means the capacity of the indoor and outdoor units do not match. It appears about 90 seconds after power supply is turned on.

Common Causes

  • Indoor/outdoor connection wire issue
  • Indoor/outdoor PCB fault
  • Incorrect specification or combination

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the wiring connection between indoor and outdoor units.

  2. 2

    Inspect the indoor and outdoor PCBs.

  3. 3

    Verify the specifications and combination table in the catalogue.

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