Panasonic CS-E10JD3EA Service Manual page 61

15.5.2. H12 (Indoor/Outdoor Capacity Rank Mismatched)
Malfunction Decision Conditions
• During startup, error code appears when different types of indoor and outdoor units are interconnected.
Malfunction Caused
• Wrong models interconnected.
• Wrong indoor unit or outdoor unit PCBs mounted.
• Indoor unit or outdoor unit PCBs defective.
• Indoor-outdoor unit signal transmission error due to wrong wiring.
• Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor and outdoor
units.
Troubleshooting
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