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17.4.18 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.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Open 3 way valve.
NO, closed.
NO, gas amount is OK.
Check 3 way valve.
3-way valve opened?
Check for gas leaking source (Refer H16).
Gas leaking?
Check other parts in refrigeration cycles.
Check for gas leaking source;
Repair or replace defected part(s).
Re-claim and then re-charge the
right amount.
YES
YES
