Fujitsu 9RLF, Service Instructions Manual

Page: 37 / 60

Trouble shooting 12
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 :
6.0 9.6 12.4 16.1 21.0 27.8 Resistance Value (k )
Temperature
OK OK
OK OK
3.8
0.6 0.8 1.2 1.7 2.5 Resistance Value (k )
Temperature
Outdoor unit Heat Ex. sensor error
Outdoor unit Main PCB
Heat exchanger temperature 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 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.
02-16
-5°C -10°C
95.6
-30°C
50.3
-20°C
80°C 70°C 60°C
30°C 20°C 10°C 5°C 0°C
50°C 40°C
Indicate or Display:
Outdoor Unit : LED 0.1sec ON/ 0.1sec OFF
Indoor Unit
: Operation lamp: 7 times Flash, Timer lamp: 3 times Flash
Economy lamp: Continuous flash.
ERROR CODE : [E : 73]
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
CN61
CN62
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(OUTDOOR)
BLACK
BLACK
BROWN
BROWN
BLACK
BLACK
1
2
3
4 1
2
3
4
1
2
3 1
2
3
CN71
CN70
AOU9RLFW AOU12RLFW, 15RLS