10 . Failure code
10.1 4MXC6518G1000AA failure code
LED flash times
of indoor PCB
Panel
display
Malfunction Description Possible reasons
LED5 LED1
Malfunction of indoor unit ambient Sensor disconnected or broke or at wrong
0 1 1 temperature sensor position or short circuit
Malfunction of indoor unit piping Sensor disconnected or broke or at wrong
0 2 2 temperature sensor position or short circuit
EEPROM chip disconnected or broken or
0 4 4 EEPROM wrong of indoor PCB wrong programmed or PCB broken
Wrong connection or the wires be
7 Abnormal communication between disconnected or wrong address setting of
0 7 indoor and outdoor units indoor unit or faulty power supply or faulty
PCB
/ Abnormal communication between Wrong connection or wired controller
broken
wired controller and indoor unit
Pump motor disconnected or at wrong
position, or the float switch disconnected or
0 12 0C Malfunction of drain system at wrong position or the short circuit bridge
disconneted
0 13 0D Zero cross sigal wrong Zero cross sigal detected wrong
0 14 0E Indoor unit DC fan motor abnormal DC Fan motor disconnected, or DC Fan
broken or circuit broken
Note:
1. The outdoor failure can also be indicated by the indoor unit,the checking method as follows: LED4 flash
times represents tens digit, LED3 flash times represents units digit, use the number at tens digit minus 20, then
will get the outdoor error code. For example, if the outdoor error code is 15, LED4 will flash 3 times firstly(30-
20=10), two seconds later, LED3 will flash 5 times. Four seconds later, the process will repeat again.
2. LED5 is a yellow one on the indoor PCB, LED1 is a green one.
3. To get much more details about the out door unit failure,please refer to the outdoor unit trouble shooting
141
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