Panasonic CS-CZ25ZKE Service Manual page 109

17.5.21 F17 (Indoor Standby Units Freezing Abnormality)
Malfunction Decision Conditions

When the different between indoor intake air temperature and indoor pipe temperature is above 10°C or indoor
pipe temperature is below -1.0°C.
Remark:
When the indoor standby unit is freezing, the outdoor unit transfers F17 error code to the corresponding indoor
unit and H39 to other indoor unit(s).
Malfunction Caused

Wrong wiring connection

Faulty sensor

Faulty expansion valve
Troubleshooting
When F17 indication happens
Check the system wiring connection.
Is the wiring connection ok?
Check the indoor intake air and indoor pipe temperature
sensors.
Does it conform to the sensor characteristic chart?
Check the expansion valve
Is the expansion valve ok?
YES
YES
NO
Caution
NO
● Perform Auto Wiring to correct the
wiring connection.
NO
● Replace the indoor intake air or indoor
pipe temperature sensor.
YES
● Replace the solenoid coil or expansion
valve
● Replace outdoor unit PCB
109
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.