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15.5.22 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
YES
NO, gas amount is OK
NO, closed
When F91 indication happens
Check 3 way valve
3-way valve opened?
●
Open 3 way valve
YES
●
Check for gas leaking source;
Repair or replace defected part(s)
●
Re-claim and then re-charge the right
amount
Check for gas leaking source (Refer to H16)
Gas leaking?
Check other parts in refrigeration cycles
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Caution
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