Trane 4TXM2318BF300AA Service Manual page 128

4MXC2324BF0W0AA
INDOOR UNIT TROUBLE SHOOTING
LED flash times
of indoor PCB
LED4 LED1
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 I.R. receiver display will sh-
ow the after converted hexadecimal code of "M+20"(DECIMAL)，for example,if the outdoor
error code is 2,the indoor unit I.R. receiver display will flash the error code 16 (2→2+20=22
→change decimal 22 to hexadecimal code,get 16）
2.LED4 is a red one on the indoor PCB,LED1 is a yellow one.
3.To get much more details about the out door unit failure,please refer to
the outdoor unit trouble shooting list.
I.R .
Contents of
RECEIVER
Malfunction
DIGITAL
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
08
controlle r (
and indoor unit
IVER)
Malfunction of drain
0C
system
Zero cross sigal
0D
wrong
Indoor unit DC fan
0E
motor abnormal
126
Possible reasons
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
or I.R. RECE faulty
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
or brok-
,
or brok-
,
,
0150516957