Fujitsu AOU18RLXFZH - Page 59

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:
Detective Actuators:
Detective details:
Forecast of Cause :
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 miss-wiring, reset the power.
Check Point2: 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 Point3: 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.
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
OK
OK
Indicate or Display:
Outdoor Unit : LED 1 : 8 time Flash
Indoor Unit : Operation lamp: 7 time Flash, Timer lamp: 7 time Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 77]
02-27
THERMISTOR
(DISCHARGE)
BROWN
BROWN
1
2
1
2
THERMISTOR
(COMPRESSOR)
1
2
BLUE
BLACK
BLACK
THERMISTOR
(HEAT SINK)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
1
2
1
2
CN25
CN26
CN23
CN22
CN21
BLACK
1
2
BLACK
THERMISTOR
(PIPE MID)
CN24
WHITE
GREEN
BLUE
RED
YELLOW