Fujitsu AMUG24LMAS Service Manual page 74

Troubleshooting 19
Compressor temperature sensor error
Detective actuators:
Compressor temperature thermistor
Detective details:
Compressor temperature thermistor short detected
Compressor thermistor open detected
Forecast of cause:
1. Connector connection failure, open
2. Thermistor failure
3. Main PCB failure
Check Point 1 : Check the connector connection and cable open
Connector connection state check
Cable open check
Check Point 2 : Check the thermistor
Thermistor characteristics check (Disconnect the thermistor from the PCB and check.)
(PARTS INFORMATION 7)
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Main PCB (CN64:1-3) voltage value = 5V (AOU24/30RGLX)
Main PCB (CN63:3-4) voltage value = 5V (AOUG36/48LMAS1)
Disconnect thermistor from main PCB, and check voltage.
AOU24RGLX
AOU30RGLX
If the voltage does not appear, replace Main PCB
the check operation again.
AOUG36LMAS1
AOUG48LMAS1
1 2 3
1 2 3
CN64
, and execute
Indicate or Display:
Indoor unit
Operation lamp: 7 times Flash,
Timer lamp
Wired remote control
Error code : [E : 72]
Outdoor unit (AOUG36/48LMAS1)
Mode Error
2
: Light OFF
1 2 3 4
1 2 3 4
CN63
03-26
: 2 times Flash
A B C D E
7 2
: Light ON n : n times blinking
DC
F