Fujitsu ASU30RLE Service Instruction page 57

Trouble shooting 18
OUTDOOR UNIT Error Method:
Discharge Thermistor Error
Detective Actuators:
Discharge temperature thermistor
Forecast of Cause:
1. Connector connection failure, open 2. Thermistor failure 3. Main PCB failure
Test 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Test 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics(Rough value)
Temperature (°C )
Temperature (°F )
Resistance value (k )
Temperature (°C )
Temperature (°F )
Resistance value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
Test 3 : Check Voltage of Controller PCB (DC 5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
BLACK
1 1
BLACK
2 2
CN62
BLACK
3 3
BLACK
4 4
If the voltage does not appear, replace Controller PCB and execute the check operation again.
Indicate of Display:
Indoor Unit :
Operation lamp: 7 times Flash,
Timer lamp
ERROR CODE : [E : 71]
Detective details:
When Discharge temperature thermistor open or short-circuit is detected
at power ON or while running compressor.
-20 -10 0
-4 14 32
531.56 292.91 168.60 100.91 62.55
70 80 90
158 176 194
8.70 6.27 4.60
Discharge Temp. Thermistor
Compressor Temp. Thermistor
: 1 times Flash
10 20 30
50 68 86
26.34
40.01
100 110 120
212 230 248
3.43 2.60 2.00
02-21
Outdoor unit :
PUMP LOW
POWER
DOWN NOISE
ERROR
(L1) (L2) (L3) (L4)
MODE
1
7
2
: Light OFF : Light ON n : n times blinking
40 50 60
104 122 140
17.79 12.30
PEAK
CUT
(L5) (L6)