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15.4.18 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.
Check for gas leaking source;
Repair or replace defected part(s).
Re-claim and then re-charge the right
amount.
YES
YES
NO, closed
NO, gas amount is OK
Check 3 way valve.
Check for gas leaking source (Refer to H16).
Gas leaking?
Check other parts in refrigeration cycles.
3-way valve opened?
Open 3 way valve.
Caution
