Panasonic CS-HZ9RKE Service Manual page 84

16.4.20 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
84
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.