Fujitsu ASG30LMTA Service Instruction page 47

Trouble shooting 11
INDOOR UNIT Error Method:
Indoor Room Thermistor Error
Detective Actuators:
Indoor unit Controller PCB
Room temperature thermistor
Forecast of Cause : 1. Connector failure connection 2. Thermistor failure 3. Controller PCB failuer
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 (°C )
Resistance value (k )
Temperature (°C )
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)
BLACK
1 1
BLACK
2 2
CN1
BLACK
3 3
BLACK
4 4
If the voltage does not appear, replace Controller PCB and execute the check operation again.
AMP Air Conditioning
Indicate or Display:
Indoor Unit :
Operation lamp: 4 times Flash,
Timer lamp
Detective details:
Room temperature thermistor is open or short is detected always.
-10 -5 0
58.3 44.0 33.6 25.9
30 35 40
8.0 6.5
5.3
Thermistor( Pipe temp.)
Thermistor( Room Temp.)
Wired Remote Controller :
ERROR CODE : [E : 41]
: 1 times Flash
5 10 15 20
20.2 15.8 12.5
45
4.4
02-14
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25
10.0
DC