30
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Operation lamp flashes upon errors being detected by sensor, while it flashes to indicate protective actions after error
mode occurs more than four times during operation.
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Microcomputer ceases to operate and operation lamp goes out if terminal fuse blows on the terminal block on the indoor
unit PCB.
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People
Sensor
Timer Operation
Details of Diagnosis Details of Abnormality
Abnormality in external ROM of outdoor unit
Electric current peak cut-off (20A)
Wrong voltage, AC voltage abnormality
Active abnormality
Compressor discharge gas overheating
protection
Indoor fan motor rotation abnormality
Abnormality on switching 4-way valve
Zero-cross abnormality
Compressor motor revolution abnormality
Outdoor fan motor rotation abnormality
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Indication on Indoor Unit
✕ …Off …Flashing ●…Illuminated
➀ Forgot to attach OTP data
➁ Incorrect insertion
➂ Defective OTP data
➃ Defective contact of IC socket
➀ Instantaneous power failure/voltage reduction
➁ Defective HIC
➂ Worn compressor
➀ Compressor operation stop, abnormality on voltage
application
➀ Gas shortage during heating/cooling operation
(more than 50% gas shortage)
➁ Blocked electronic expansion valve or capillary tube
➂ Defective compressor temp. sensor
➃ Outdoor fan motor fails to rotate during cooling
operation
➀ Defective fan motor position locating sensor,
disconnection of fan motor winding
➁ Disconnected connector
➂ Defective fan motor drive circuit
➀ Disconnected outdoor DC fan motor
➁ Locked
➂ Defective PCB
➀ 4-way valve does not switch
➁ Abnormality on control PCB
➀ Failure in DC compressor rotation which is not
caused by defective HIC
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