Fujitsu ASTG18KMTC Service Instruction

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 :
62.6100.9134.2168.6221.1292.9531.61013.1Resistance Value (k )
Temperature
OKOK
OKOK
40.0
2.03.44.66.38.7Resistance 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.
90°C80°C70°C
26.3
40°C
17.8
50°C
12.3
60°C
30°C
100°C
2.6
110°C
5°C0°C-5°C-10°C-20°C-30°C
20°C10°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
P1
P5
02-23

Fujitsu ASTG18KMTC Specifications

General

Brand	Fujitsu
Model	ASTG18KMTC
Category	Air Conditioner
Language	English