13
Troubleshooting
INDEE R UNIT TRE UBLE SHEE TING
AD125/140S2SM3FA,AD125/140S2SM4FA
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 PCB hardware malfunction
0
0
0
0
0
7
8
12
13
14
07
07
*flashing
0C
0D
0E
Abnormal communi-
cation between wired
controller and indoor
unit
Wron
g connection or wired
controller broken,or PCB
hardware malfunction
Malfunction of drain
system
Zero cross sigal
wrong
Zero cross sigal detected
wrong
communication wire discone-
cted or wrong conected or
PCB hardware malfunction
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
Abnormal communi-
cation between main
control PCB & fan mo-
tor driver
0
15
0F
Fan motor overcurrent fan motor current too high
0
17
11
DC voltage high or low
DC voltage of the fan motor
driver too high or too low
18
0
12
Fan motor driver over 95℃
F.M.D temperature high
19
0
13
Fan motor out of step
wrong rotor location detected
M(≥1) N(≥0)
/
Error of the outdoor unit See note 1,2
Note:
1.The outdoor failure can also be indicated by the indoor unit,the checking method as
following:outdoor unit error code=(M*10+N)-20.LED4 flash M times and LED3 flash N times .
2. LED4 is a yellow one on the indoor main control 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.4.For YR-E17,communication error between indoor PCB and wired controller,
07 will flash in the main display interface instead of display at the check interface.
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