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Page 38
Troubleshooting
mrcool.com
O
peration LED
T
imer LED
D
isplay
L
ED STATUS
X E
0
2
times
X E
1
X E
2
X E
3/E88
X E
4
X E
5
E
vaporator coil temperature sensor T2 open circuit or
short circuit
X E
C
O F
1
O F
2
O F
3
O F
4
O F
5
P
0
P
1
P
2
P
4
1 time
Condenser coil temperature sensor T3 open circuit or
short circuit
Indoor unit EEPROM parameter error
Indoor / outdoor units communication error **
Zero-crossing signal detection error
Indoor fan speed has been out of control
Indoor room temperature sensor T1 open circuit or
short circuit
Refrigerant leakage detection
Outdoor ambient temperature sensor T4 open circuit
or short circuit
Compressor discharge temperature sensor T5 open
circuit or short circuit
Outdoor unit EEPROM parameter error
Outdoor fan speed has been out of control
IPM malfunction or IGBT over-strong current protection
Over voltage or over low voltage protection
High temperature protection of compressor top diag-
nosis and solution (only for 9k,12k models)
Inverter compressor drive error
3 times
4 times
5 times
6 times
7 times
2 times
3 times
4 times
5 times
6 times
1 time
2 times
3 times
5 times
P
6
P
7
Discharge temp sensor
USB Smart Controller module not installed
O（light） X（off） （flash）
Indoor Unit Error Display
**
Note that the wire colors of this series / model may differ from previous models, other series and
general conventions.
All wiring must be performed in accordance with the wiring diagrams shown in
Section 7 Fig. 7.1 and associated images
. Wires and terminals are numbered to match accordingly.
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