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17.4.27 F91 (Refrigeration Cycle Error)
Troubleshooting
Diagnosis Procedures and Cause
Measures to be Taken
For some models, the sensor is not connected by a connector
but it is directly soldered to the board.
In this case, replace the control board.
There is a gas leak
Abnormal
Normal
Yes
High
There is no
gas leak
No
Check if the 2- and 3-way valves are open.
Gas pressure is high or low?
Check for presence of gas leak.
Open the 2- and 3-way valves.
Replace the compressor.
Replace the part from which gas is
leaking.
Replace the capillary tube or
expansion valve.
Abnormal
Check for the characteristics of the indoor unit heat exchanger temperature sensor.
Refer to the characteristic table for electronic circuit diagram.
(Remove the connector and check the resistance value of the sensor.)
Replace the indoor unit heat
exchanger temperature sensor.
Normal
Check the gas pressure during the rated cooling operation.
Replace the outdoor unit control board.
Low
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