Panasonic · CS-Z
This error indicates that the indoor unit's standby unit is freezing. It occurs when the difference between indoor intake air temperature and indoor pipe temperature is too high, or the indoor pipe temperature is too low.
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Check for correct wiring connections to the indoor unit.
Inspect the sensor for any damage or disconnections.
Verify the expansion valve is functioning correctly.
If issues persist, contact a licensed technician for further diagnosis and repair.