Panasonic CS-C18PKF Service Manual page 71

13.15.2.6 Sunlight Sensor Abnormality
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Abnormality detection:
When ECONAVI is ON, if the sunlight intensity value below minimum level continuously for 24 hours, the
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sunlight sensor disconnection error counter will increase by 1 time. If the ECONAVI is OFF, the 24 hours
timer will be reset, but the sunlight sensor disconnection error counter will not be reset.

Error Code judgment
When sunlight sensor disconnection error counter reached 15 times, sunlight sensor is judged as abnormal.
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No ECONAVI indicator blinks. Until ECO check code sent during ECONAVI operation ON, the ECONAVI
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indicator will blinks.

When error code happened, the unit is able to operate without sunlight sensor.
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