Fujitsu AOU18RLB - Outdoor Thermistor Error

Trouble shooting 14
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
26.935.246.662.384.2115.2Resistance Value (k )
Temperature (°F)
OKOK
OKOK
20.7
6.4
6.21 0.8
Resistance Value (k )
Temperature (°F)
Outdoor Thermistor Error
Outdoor unit Main PCB
Outdoor 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 miss-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.
5°F-4°F
95°F
5.2
104°F
4.2
113°F
3.5
122°F
2.8
131°F
86°F
50°F41°F32°F23°F14°F
68°F
Indicate or Display:
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.
02-17
Outdoor Unit : No indication
Indoor Unit : Operation lamp: 7 time Flash, Timer lamp: 4 time Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 74]
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(OUTDOOR)
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
1
2
3
4
1
2
3
4
1
2
3
1
2
3
CN61
CN62