Error code reference
Panasonic Air Conditioner Error Code H12
Indoor unit capacity unmatched
Indoor unit capacity unmatched — different types of indoor and outdoor units are interconnected or PCBs mismatched.
First step from the service manual
Check the indoor and outdoor unit connection wires for wiring errors.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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