Fujitsu AOTG36LATT, Service Manual

Page: 151 / 264

Trouble shooting 13
INDOOR UNIT
OUTDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
Check Point 3 :
62.6 100.9 134.2 168.6 221.1 292.9 531.6 1013.1 Resistance Value (k )
Temperature
OK OK
OK OK
40.0
2.0 3.4 4.6 6.3 8.7 Resistance Value (k )
Temperature
Discharge temp. sensor error
Outdoor unit Main PCB
Discharge pipe temperature thermistor
When Discharge pipe 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.
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.
02-15
90°C 80°C 70°C
26.3
40°C
17.8
50°C
12.3
60°C
30°C
100°C
2.6
110°C
5°C 0°C -5°C -10°C -20°C -30°C 20°C 10°C
120°C
Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF
Indoor Unit : Operation lamp: 7 times Flash, Timer lamp: 1 time Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 71]
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