39
●
Operation lamp flashes upon errors being detected by sensor, while it flashes to indicate protective actions after error
mode occurs more than twice during operation.
●
Microcomputer ceases to operate and operation lamp goes out if the fuse on the indoor unit PCB blows.
(continued)
Details of Diagnosis
Details of Abnormality
Defective external ROM for the
outdoor unit
➀
Forgot to attach OTP data
➁
Incorrect insertion
➂
Defective OTP data
➃
Defective contact of IC socket
Current peak cut (15A, 20A)
➀
Instantaneous power failure/voltage reduction
➁
Defective HIC
➂
Worn compressor
Defective current control
➀
Compressor operation stop, Abnormality on voltage
application
➁
Abnormality on AC input voltage
Compressor discharge gas
overheating protection
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
Indoor fan motor rotation abnormality
➀
Defective fan motor position locating sensor, disconnection
of fan motor winding
➁
Disconnected connector
➂
Defective fan motor drive circuit
●
…Illuminated
…Flashing …Off
●
●
●
●
●
●
●
●
●
●
●
Abnormality on outdoor DC fan motor
rotation
*
This lamp lights only when conducting service inspections.
➀
Disconnected outdoor DC fan motor
➁
Locked
➂
Defective PCB
Operation
Service
*
Timer
Display Lamp
➀
Defective DC compressor position locating circuit
●
●
Abnormality on DC compressor
rotation
NOTE
11-2-3. Self-Diagnosis Function Fails to Work
Check indoor unit.
Is the fuse blown?
Replace controller.
Replace PCB or fuse.
●
No lamp comes on and indoor fan fails to rotate.
●
Check that main power is in receptacle.
●
Check the power voltage.
Yes
OK
