Fujitsu ASU18RLB Service Instructions Manual page 41

Split type room air conditioner wall mounted type inverter
Hide thumbs Also See for ASU18RLB:
Table of Contents

Advertisement

Trouble shooting 14
OUTDOOR UNIT Error Method:
Outdoor Thermistor Error
Detective Actuators:
Outdoor unit Main PCB
Outdoor thermistor
Forecast of Cause :
1. Connector connection 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 miss-wiring, reset the power.
OK
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Approx. value)
Temperature (°F)
Resistance Value (k )
Temperature (°F)
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
OK
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)
THERMISTOR
(PIPE)
BLACK
BLACK
BLACK
BLACK
THERMISTOR
(DISCHARGE)
THERMISTOR
(OUTDOOR)
BLACK
BLACK
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 74]
Detective details:
When Outdoor temperature thermistor open or short-circuit is
detected at power ON or while running the compressor.
2.Thermistor failure
-4°F
5°F
14°F
23°F
115.2
84.2
62.3
46.6
95°F
104°F
113°F
122°F
6.4
5.2
4.2
1
1
2
2
CN61
3
3
4
4
1
1
CN62
2
2
3
3
: Operation lamp: 7 time Flash, Timer lamp: 4 time Flash
Economy lamp: Continuous flash.
3. Main PCB failure
32°F
41°F
50°F
20.7
35.2
26.9
131°F
3.5
2.8
02-17
68°F
86°F
1
2
6 .
8
0 .

Hide quick links:

Advertisement

Table of Contents
loading

This manual is also suitable for:

Aou18rlbAsu24rlbAou24rlb

Table of Contents