Error code reference
Panasonic Air Conditioner Error Code F17
Indoor standby units freezing abnormality
Indoor standby units freezing abnormality — wrong wiring/connecting pipe, expansion valve leakage, or indoor heat exchanger sensor open circuit (3 times within 40 minutes).
First step from the service manual
Check the system wiring connection.
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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