Panasonic CS-HZ9RKE Service Manual page 86

16.4.22 F91 (Refrigeration Cycle Abnormality)
Malfunction Decision Conditions

The input current is low while the compressor is running at higher than the setting frequency.
Malfunction Caused

Lack of gas.

3-way valve close.
Troubleshooting
When F91 indication happens
Check 3 way valve
3-way valve opened?
Check for gas leaking source (Refer to H16)
Gas leaking?
Check other parts in refrigeration cycles
YES
NO, gas amount is OK
Caution
NO, closed
● Open 3 way valve
● Check for gas leaking source;
YES
Repair or replace defected part(s)
● Re-claim and then re-charge the
right amount
86
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.