MXS Service Manual

Code Indication on Remote Controller SiUS121736EA
149 Service Diagnosis
4. Code Indication on Remote Controller
4.1 RA Indoor Unit
4.2 SA Indoor Unit
Note: When there is a possibility of open phase power supply, also check power supply.
Error Codes Description Reference Page
00 Normal condition —
A1 Indoor unit PCB abnormality 151
A5 Freeze-up protection control, heating peak-cut control 153
A6
Indoor fan motor or
related abnormality
DC motor
(CTXG, FTXR, CTXS, FTXS, FVXS series)
154
AC motor (CDXS, FDXS series) 156
C4 Indoor heat exchanger thermistor or related abnormality 158
C7 Front panel open/close fault (CTXG, FTXR series only) 159
C9 Room temperature thermistor or related abnormality 158
U4 Signal transmission error (between indoor unit and outdoor unit) 160
UA Mismatching of indoor unit and outdoor unit 162
Error Codes Description Reference Page
00 Normal condition —
A1 Indoor unit PCB abnormality 163
A3 Drain level control system abnormality 164
A6
Indoor fan motor (DC motor) or related abnormality
(See the Note below.)
165, 167
A8 Indoor fan PCB abnormality 169
AF Humidifier or related abnormality 170
C4 Indoor heat exchanger thermistor 1 or related abnormality 171
C5 Indoor heat exchanger thermistor 2 or related abnormality 171
C9 Room temperature thermistor or related abnormality 171
CE Presence sensor or floor sensor abnormality 172
CJ Remote controller thermistor abnormality 173
U4 Signal transmission error (between indoor unit and outdoor unit) 174
U5
Signal transmission error (between indoor unit and remote
controller)
176
U8
Signal transmission error (between MAIN remote controller and
SUB remote controller)
177
UA Mismatching of indoor unit and outdoor unit 178