Fujitsu ASU7RLF1 Service Instructions Manual page 43
Split type room air conditioner compact wall mounted / wall mounted / floor
compact cassette / slim duct inverter multi
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Also See for ASU7RLF1:
- Service manual (61 pages) ,
- Service bulletin (3 pages) ,
- Design & technical manual (319 pages)
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Trouble shooting 8
INDOOR UNIT Error Method:
Indoor Heat Ex. Thermistor Error
Detective Actuators:
Indoor Unit Controller PCB
Heat Exchanger (MID) Thermistor
Forecast of Cause : 1. Connector failure connection 2. Thermistor failure 3. Controller PCB failure
Check Point 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
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Rough 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
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
Compact wall mount circuit diagram (Connector connection)
BLACK
1
1
H/E Thermistor
BLACK
2
2
CN4
BLACK
3
3
Room Temp. Thermistor
BLACK
4
4
Wall mount circuit diagram (Direct soldering to PCB)
RED
BLACK
1
1
1
CN3
2
2
2
WHITE
BLACK
3
3
BLACK
1
Room Temp. Thermistor
CN1
BLACK
2
Floor circuit diagram (Connector connection and Direct soldering to PCB)
GRAY
1
1
H/E (MID) Thermistor
CN3
GRAY
2
2
BLACK
1
Room Temp. Thermistor
CN1
BLACK
2
If the voltage does not appear, replace Controller PCB and execute the check operation again.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 42]
Detective details:
Heat Exchanger (MID) thermistor is open or short is detected always.
32
41
176.0
134.2
104
113
25.6
20.9
H/E Thermistor
: Operation lamp: 4 time Flash, Timer lamp: 2 time Flash
Economy lamp: Continuous flash.
50
59
6
8
103.3
80.3
62.95
122
17.1
Compact cassette circuit diagram (Connector connection)
GRAY
1
1
H/E (MID) Thermistor
CN5
GRAY
2
2
BLACK
1 1
Room Temp. Thermistor
CN8
BLACK
2 2
Slim duct circuit diagram (Connector connection)
GRAY
1
1
H/E (MID) Thermistor
CN5
GRAY
2
2
1
CN7
2
BLACK
1 1
Room Temp. Thermistor
CN8
BLACK
2 2
02-11
7
7
86
95
49.7
39.6
31.7
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Troubleshooting
