Panasonic CS-E9RKUAW Service Manual page 93

18.4.16 H70 (Light Sensor Abnormality)
Malfunction Decision Conditions

Feedback signal of light sensor.
Malfunction Caused

Feedback value is 0 VDC continuously.
Troubleshooting
When abnormality indication starts again.
Check the connector connection:
Turn off the power.
Check the connector connection.
Is the connector connection normal?
Check if the feedback signal of sunlight sensor (pin 11 and 13)
is normal.
Depends on indoor light intensity, feedback voltage
= 0.06 ~ 4.8 VDC (from dim to bright).
YES
YES
93
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
NO
Connector poor contact.
Correct the connection.
NO
Defect in sunlight sensor.
Replace the sinlight sensor.
Defect in indoor unit PCB.
Replace the indoor unit PCB.