Error code reference
Panasonic Air Conditioner Error Code H11
Indoor/outdoor abnormal communication
Indoor/outdoor abnormal communication — communication between indoor and outdoor units not established.
First step from the service manual
Check the indoor-outdoor units' 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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