Fujitsu ASU18RLF Service Instruction

Trouble shooting 19
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
86°F
12.6Resistance Value (k )
68°F
16.1
59°F-4°FTemperature(°F)
3.45Resistance Value (k )
122°F 140°F
5.18
104°FTemperature(°F)
Outdoor Thermistor Error
Outdoor Unit Main PCB Circuit
Outdoor Temperature Thermistor
When Outdoor 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.
02-23
THERMISTOR (DISCHARGE)
BROWN
CN25 CN26 CN23 CN22 CN21
1 2
Refer to error code table.
THERMISTOR (COMPRESSOR)
BROWN
1 2
1 2 1 2 1 2
BLUE BLACK BLACK
THERMISTOR (HEAT SINK) THERMISTOR (OUTDOOR) THERMISTOR (PIPE)
7.97
158°F
1.652.36
23°F14°F 32°F 41°F 50°F
115 62.3 46.6 35.2 26.9 20.7
OK
OK

Fujitsu ASU18RLF Specifications

General

Brand	Fujitsu
Model	ASU18RLF
Category	Air Conditioner
Language	English