Fujitsu ARTG60LHTA

Trouble shooting 20
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators: Detective details:
Forecast of Cause :
OKOK
OKOK
Outdoor unit Heat Ex. liquid temp.
sensor error
Outdoor unit Main PCB
Heat exchanger temperature thermistor (MID)
Heat exchanger temperature thermistor (OUT)
When Heat exchanger 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 if connector is 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.
02-22
Refer to error code table.
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
BROWN
BROWN
BROWN
BROWN
BLUE
BLUE
123 123
123 12312
1212
12
123 123 123 123
THERMISTOR
( HEAT EXCHANGER MID. )
THERMISTOR
( HEATSINK PFC )
THERMISTOR
( DISCHARGE PIPE )
THERMISTOR
( HEAT EXCHANGER OUT )
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( COMPRESSOR TEMP. )
CN22
CN23
CN24
CN25
CN26
CN27
Resistance Value (k )
Temperature(°C)
Resistance Value (k )
Temperature(°C)
-30 -20 -10 0 10 20 30 40 50
60 70 80
95.6 50.3 27.8 16.1 9.6 6.0 3.8 2.5 1.7
1.2 0.8 0.6