Fujitsu AUXB04GALH Service Manual page 107

Trouble shooting 21
INDOOR UNIT Error Method:
Inlet air temp. Sensor Error
Forecast of Cause :
1. Connector defective connection
Check Point 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if sensor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Sensor resistance value
Sensor characteristics (Rough value)
Temperature (
°F)
Temperature ( °C)
Resistance Value (k )
Voltage Value (V)
Temperature ( °F)
Temperature ( °C)
Resistance Value (k )
Voltage Value (V)
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Corresponding connector
Model Type
Duct type
Cassette type
Compact Wall mounted type
Wall mounted type
Floor / Ceiling type
If the voltage does not appear, replace Controller PCB and set up the original address.
Indicate or Display:
E41. 1
Outdoor Unit : E.5 U.1
Indoor Unit
Error Code
Detective details:
When Inlet air temp. sensor open or shortage is detected
2. Sensor defective
32 41 50
0 5 10
33.6 25.9 20.2
1.15 1.39 1.66
104 113 122
40 45 50
5.3 4.3 3.6
3.27 3.48 3.68
Room temp. Sensor
(Black Wires)
CN8
: Operation LED 4 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
: 4 1
3. Controller PCB defective
59 68 77
15 20 25
15.8 12.5 10.0
1.94 2.22 2.50
04-31
86 95
30 35
8.0 6.5
2.77 3.03
DC