Fujitsu AOTG36LATT, Service Manual

Page: 153 / 264

Trouble shooting 15
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
26.9 35.2 46.6 62.3 84.2 115.2 Resistance Value (k )
Temperature
OK OK
OK OK
20.7
6.4 8.0 10.0 12.6 16.1 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.
02-17
-15°C -20°C
224.3
-30°C
159.7
-25°C
35°C
5.2
40°C
4.2
45°C
3.5
50°C
2.8
55°C 30°C 25°C
10°C 5°C 0°C -5°C -10°C
20°C 15°C
Indicate or Display:
Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF
Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: 4 times Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 74]
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