Fujitsu ASU12RLF1

Trouble shooting 17
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
OKOK
OKOK
Compressor Thermistor Error
Outdoor Unit Main PCB Circuit
Compressor Temperature Thermistor
When Compressor 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 (Rough 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.
02-21
THERMISTOR (DISCHARGE)
THERMISTOR (PIPE) THERMISTOR (OUTDOOR) THERMISTOR (COMPRESSOR) THERMISTOR (HEAT SINK)
BROWN BLACK BLACK BLUE BROWN
CN25 CN26 CN23 CN22 CN21
1 21 21 21 21 2
Refer to error code table.
17.826.3
68°F
40.062.579.1101130169Resistance Value (k )
59°F50°F41°F32°FTemperature(°F)
12.3
86°F
122°F104°F
140°F
2.003.434.606.278.69Resistance Value (k )
248°F212°F194°F176°F158°FTemperature(°F)