Panasonic WH-ADF0309J3E5CM Service Manual page 278

25.2.31 Refrigeration Cycle Abnormality (F91 / P15 / F24)
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
278
For safety reason and to prevent
component breakdown, always switch
Caution
off the power before remove and
connect the component.
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