Fujitsu AOU09RL2, Service Instructions Manual

Page: 37 / 62

Trouble shooting 12
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
26.53 34.57 45.40 60.23 80.56 109.0 Resistance Value (k )
Temperature
OK OK
OK OK
20.56
6.408 7.978 10.00 12.26 16.04 Resistance Value (k )
Temperature
Outdoor temp. sensor error
Outdoor unit Main PCB
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.
02-14
-15°C
(5°F)
-20°C
(4.0°F)
35°C
(95°F)
5.184
40°C
(104°F)
4.216
45°C
(113°F)
3.451
50°C
(122°F)
2.841
55°C
(131°F)
30°C
(86°F)
25°C
(77°F)
10°C
(50°F)
5°C
(41°F)
0°C
(32°F)
-5°C
(23°F)
-10°C
(14°F)
20°C
(68°F)
15°C
(59°F)
Indicate or Display:
Refer to error code table.
Check Point 3 :
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.
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
CN71
CN70