Troubleshooting ESIE05-04
3–26 Part 3 – Troubleshooting
1.7 Overview of Error Codes
Q In the case of the shaded error codes, “inspection” is not displayed. The system operates, but be
sure to inspect and repair it.
Notes: 1 There is a possibility of open phase power supply, check power supply also.
2 Operation when a malfunction occurs may differ according to the model.
Malfunction Code Contents/Processing Remarks
A1 Failure of PC board ass’y for indoor unit
A3 Malfunction of drain water level system
A6 Indoor unit fan motor overload / overcurrent / lock (Note 1)
AF Abnormal drain water level Activation of float switch during compressor off.
AJ Failure of capacity setting Either capacity data is set incorrectly, or capacity
has not been set for the data IC
C4 Malfunction of heat exchanger temperature
sensor system
C5 Malfunction of gas piping temperature sensor
system
C9 Malfunction of suction air temperature sensor
system
CC Malfunction of humidity sensor system FCQ-D only.
CJ Malfunction of remote control air temperature
sensor system
Failure of remote controller air thermistor.
Unit can be operated by indoor unit thermistor.
U4/UF Failure of transmission (between indoor and
outdoor unit)
Transmission between indoor and outdoor unit is
not being correctly carried out. (Note 1, Note 2)
U5 Failure of transmission (between indoor unit and
remote controller)
Transmission between indoor and remote
controller is not being correctly carried out.
U8 Failure of transmission (between “main” and
“sub” remote controller
Transmission between “main” and “sub” remote
controller is not being correctly carried out.
UA Failure of fieldsetting System fieldsetting error pair, twin, triple, double
twin or wrong capacity class.
UC Address error of central remote controller
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