Trane 4TXM2318BF300AA Service Manual page 129

4MXD2309BF0R0AA 4MXD2312BF0R0AA 4MXD2318BF0R0AA 4MXD2324BF0R0AA
INDOOR UNIT TROUBLE SHOOTING
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 th h e indo o o o r un n it,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,please refer to
the outdoor unit trouble shooting list.
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-
07
cation between indo-
or and outdoor units
Abnormal communi-
cation between wired
/
controlle e r and indoor
unit
Malfunction of drain
0C
system
Zero cross sigal
0D
wrong
Indoor unit DC fan
0E
motor abnormal
m
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 slave unit
malfunction in MAXI system
Wrong connection or wired
controller broken,or PCB
f f aulty
Pump motor disconnected
or at wrong position,or the
float switch disconnected，
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
127
Possible reasons
or brok-
,
or brok-
,
,
0150521239