Fujitsu AB*18LBAJ Service Instruction

Trouble shooting 19
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
OKOK
OKOK
Heat Sink Temperature
Thermistor Error
Outdoor Unit Main PCB Circuit
Heat Sink Temperature Thermistor
When Heat Sink Temperature Thermistor open or short-circuit is
detected at power ON or while running the compressor.
1. Connector connection failure 2.Thermistor failure 3. Main PCB failure
Check Point 1 : Check connection of Connector
Check if connector is removed.
Check erroneous connection.
Check if thermistor cable is open.
>>Upon correcting the removed connector or mis-wiring, reset the power.
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)
If the voltage does not appear, replace Main PCB.
02-29
THERMISTOR (DISCHARGE)
THERMISTOR (PIPE) THERMISTOR (OUTDOOR) THERMISTOR (HEAT SINK)
BROWN BLACK BLACK BLUE
CN25 CN23 CN22 CN21
1 21 21 21 2
Refer to error code table.
30°C
6.109.7312.416.1
Resistance
Value (k )
20°C
7.67
15°C10°C5°C0°C
Temperature
1.79
1.25 0.89
Resistance
Value (k )
50°C
60°C 70°C
0.65
80°C
0.48
90°C
0.36
100°C
0.21
12.3 8.69 6.27 4.60 3.43 2.00
120°C
2.623.95
62.5101130169 79.1
17.826.340.0
40°C
Temperature
AO*18L/ 24L
AO*30L
AO*18L/ 24L
AO*30L

Fujitsu AB*18LBAJ Specifications

General

Brand	Fujitsu
Model	AB*18LBAJ
Category	Air Conditioner
Language	English