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Troubleshooting
INDOOR UNIT TROUBLE SHOOTING
AD71S2SM7FA/AD100S2SM7FA/AD125S2SM7FA/AD140S2SM7FA
LED flash times
of indoor PCB
LED4
LED3
0
1
0
2
0
4
0
7
0
8
0
12
0
13
0
14
Note:
1.The outdoor failure can also be indicated by the indoor unit,the checking method as follo-
ws: If the outdoor error code is M(DECIMAL)，the indoor unit's wired controller display will
show the after converted hexadecimal code of "M+20"(DECIMAL),for example,if the outdoor
error code is 2,the indoor unit wired controller display will flash the error code 16 (2→2+20=22
→change decimal 22 to hexadecimal code,get 16）
2.To get much more details about the out door unit failure,ple ase refer to
the outdoor unit trouble shooting list.
3.For YR-E17 communication error between I.D.PCB and wired controller
07 will flash in the main display not the check display interface .
Wired
Contents of
controller
Malfunction
display
Malfunction of indoor
01
unit ambient temper-
ature sensor
Malfunction of indoor
02
unit piping temper-
ature sensor
EEPROM wrong of
04
indoor PCB
Abnormal communi-
cation between indo-
07
or and outdoor units
Abnormal communi-
07
cation between wired
controll e r and indoor
*
flashing
unit
Malfunction of drain
0C
system
Zero cross sigal
0D
wrong
Indoor unit DC fan
0E
motor abnormal
Sensor disconected
en,or at wrong position,or
short circuit
Sensor disconected
en,or at wrong position,or
short circuit
EEPROM chip disconected
or broken or wrong program-
med,or PCB broken
Wrong connection,or the
wires be disconected or wro-
ng adress setting of indoor
unit or faulty power supply
or faulty PCB or
malfunction in MAXI system
Wrong connection or wired
controller broken,or PCB
faulty
Pump motor disconnected
or at wrong position,or the
float swit
or at wrong position,or the
short circuit bridge disconne
ted
Zero cross sigal detected
wrong
DC Fan motor disconnected
or DC Fan broken or circuit
broken or motor blocked
12
Possible reasons
or brok-
,
or brok-
,
sub
unit
ch disconnected ，
,
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Table of Contents
Troubleshooting
