Inlet Air Temp. Sensor Error; Check Connection Of Connector; Remove Connector And Check Sensor Resistance Value - Fujitsu Airstage VR-II Series Service Manual

Trouble shooting 21
INDOOR UNIT Error Method:

Inlet air temp. Sensor Error

Detective Actuators:
Indoor Unit Controller PCB Circuit
Inlet air temp Sensor
Forecast of Cause : 1. Connector defective connection 2. Sensor defective 3. Controller PCB defective
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 ( )
Temperature ( °F)
Temperature ( °C)
Resistance Value ( )
If Sensor 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 type
Wall type
Floor/Ceilling 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
32 41 50
0 5 10
33.6 25.2 20.1
104 113 122
40 45 50
5.3 4.3 3.5
Room temp. Sensor (Black Wires)
CN8
: Operation LED 4 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
: 4 1
59 68 77
15 20 25
15.8 12.5 10.0
04-30
86 95
30 35
8.0 6.5
DC