Fujitsu ARU18RLF Service Instruction

92.3 49.2 27.5 16.1 9.7 6.1 3.9 2.6
1.8 1.2 0.9 0.6 0.5 0.4
Trouble shooting 22
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
Heat Sink 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.
02-26
THERMISTOR (DISCHARGE)
BROWN
CN25 CN26 CN23 CN22 CN21
1 2
Refer to error code table.
BROWN
1 2
104°F
Resistance Value (k )
86°F-22°FTemperature(°F)
Resistance Value (k )
140°F
Temperature(°F)
122°F
212°F194°F176°F158°F
-4°F 14°F 32°F 50°F 68°F
THERMISTOR (COMPRESSOR)
1 2 1 2 1 2
BLUE BLACK BLACK
THERMISTOR (HEAT SINK) THERMISTOR (OUTDOOR) THERMISTOR (PIPE)
OK
OK

Fujitsu ARU18RLF Specifications

General

Brand	Fujitsu
Model	ARU18RLF
Category	Air Conditioner
Language	English