Outdoor Temperature Sensor Error - Fujitsu AB A30LBT Series Service Instruction

Trouble shooting 7
OUTDOOR UNIT Error Method:

Outdoor Temperature Sensor Error

Detective Actuators:
Outdoor Unit Main PCB Circuit
Outdoor Temperature Thermistor
Forecast of Cause:
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.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Approx. value)
Temperature (°C )
Resistance Value (k )
Temperature (°C )
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
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)
BROWN
1 1
CN 64 2 2
BROWN
3 3
BLUE
1 1
CN 62
2 2
BLUE
3 3
BROWN
1 1
CN 63
2 2
BROWN
3 3
BLACK
1 1
CN 65 2 2
BLACK
3 3
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When Outdoor Temperature Thermistor open or short-circuit is
detected at power ON or while running the compressor.
-20 -10 -5
115 62.3 46.6
30 40 50
7.97 5.18 3.45
THERMISTOR
( COMPRESSOR TEMP. )
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( DISCHARGE PIPE )
THERMISTOR
( HEAT EXCHANGER )
02-11
0 5 10
35.2 26.9 20.7
60 70
2.36 1.65
15 20
16.1 12.6
DC