Fujitsu ARC90LHTA - Page 39

Trouble shooting 6
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators: Detective details:
Forecast of Cause :
OK
OK
OKOK
1013.1 531.6 292.9 168.6 100.9 62.5 40.0 26.3 17.8
12.3 8.7 6.3 4.6 3.4 2.6 2.0
Resistance value (k )
-30 -20 -10 0 10 20 30 40 50
60 70 80 90 100 110 120
Temperature (°C )
Resistance value (k )
Temperature (°C )
Outdoor discharge pipe temperature
thermistor error
Outdoor unit Main PCB
Discharge pipe temperature thermistor
When Discharge pipe 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.
02-08
Refer to error code table.
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.
CN141
CN143
CN144
THERMISTOR
( DISCHARGE PIPE )
THERMISTOR
( HEAT EXCHANGER OUT )
THERMISTOR
( OUTDOOR TEMP
. )
THERMISTOR
( COMPRESSOR TEMP
. )
1 2 1 2
5 6
3 4 5 6 3 4
1 2 3 4 1 2 3 4
1 2 3 1 2 3
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