York YHKMXH009BARX-FX, Service Manual, Page: 247 / 269

LED flash times
of indoor PCB
Wired
controller
display
Contents of
Malfunction
Possible reasons
LED4 LED3
0
0
0
1
2
4
01
02
04
Malfunction of indoor
unit ambient temper-
ature sensor
Sensor disconected
,
or brok-
en,or at wrong position,or
short circuit
Malfunction of indoor
unit piping temper-
ature sensor
EEPROM wrong of
indoor PCB
EEPROM chip disconected
or broken or wrong program-
med,or PCB broken
Abnormal communi-
cation between indo-
or and outdoor units
Wrong connection,or the
wires be disconected or wro-
ng adress setting of indoor
unit or faulty power supply
or faulty PCB
0
0
0
0
0
7
8
12
13
14
07
/
0C
0D
0E
Abnormal communi-
cation between wired
controller and indoor
unit
Wrong connection or wired
controller broken,or PCB
faulty
Malfunction of drain
system
,
Zero cross sigal
wrong
Zero cross sigal detected
wrong
Indoor unit DC fan
motor abnormal
DC Fan motor disconected
，
or DC Fan broken or circuit
broken
Note:
1.The outdoor failure can also be indicated by the indoor unit,the checking method as follo-
ws: LED4 flash times stands for ten's place,and LED3 flash times stands for one's place,
use this ten-digit number minus 20,then will get the outdoor error code.For example,if the
outdoor error code is 15,LED4 will flash 3 times firstly,two seconds later,LED3 will flash 5
times , and four seconds later the process will repeat again.
2.LED4 is a yellow one on the indoor PCB,LED3 is a green one.
3.To get much more details about the out door unit failure,please refer to
the outdoor unit trouble shooting list.
INDOOR UNIT TROUBLE SHOOTING
0150511710
Sensor disconected
,
or brok-
en,or at wrong position,or
short circuit
Pump motor disconnected
or at wrong position,or the
float switch disconnected
，
or at wrong position,or the
short circuit bridge disconne
ted
YH3MXH009BARX-GX YH3MXH012BARX-GX YH3MXH018BARX-GX YH3MXH024BARX-GX
245