Fujitsu AOU18RLB - Heat Ex.(Pipe) Thermistor Error

Trouble shooting 13
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
6.9 0.612.416.121.027.8Resistance Value (k )
Temperature (°F)
OKOK
OKOK
3.8
2.1 8.0 6.0
5.2 7.1
Resistance Value (k )
Temperature (°F)
Heat Ex.(Pipe) Thermistor Error
Outdoor unit Main PCB
Heat exchanger thermistor
When Heat exchanger 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.
23°F14°F
176°F158°F140°F
86°F68°F50°F41°F32°F
122°F104°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.
02-16
Outdoor Unit : No indication
Indoor Unit : Operation lamp: 7 time Flash, Timer lamp: 3 time Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 73]
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