Fujitsu ASU18RLF Service Instructions Manual page 36
Split type room air conditioner wall mounted type inverter
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Also See for ASU18RLF:
- Service instructions manual (100 pages) ,
- Design & technical manual (51 pages) ,
- Service manual (21 pages)
Table of Contents
Trouble shooting 13
OUTDOOR UNIT Error Method:
Heat Ex. Liquid Outlet Thermistor Error
Detective Actuators:
Outdoor Unit Main PCB
Heat Exchanger Temperature Thermistor
Forecast of Cause :
1. Connector connection failure
Check Point 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
OK
OK
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
Temperature
(°C )
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)
BROWN
BROWN
BLUE
BLUE
BLACK
BLACK
BROWN
BROWN
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When Heat Exchanger Temperature Thermistor (Out) open or
short-circuit is detected at power ON or while running the compressor.
2. Thermistor failure
-10
-5
0
5
14
23
32
41
27.3
20.8
16.1
12.6
THERMISTOR
( COMPRESSOR TEMP. )
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( HEAT EXCHANGER )
THERMISTOR
( DISCHARGE PIPE )
02-15
3. Main PCB failure
10
15
20
25
50
59
68
77
9.74
7.67
6.09
4.87
35
30
86
95
3.92
3.17
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Troubleshooting
