Discharge Air Temp. Thermistor - Fujitsu Airstage VR-II Series Service Manual

Table of Contents

Advertisement

Trouble shooting 83
INDOOR UNIT Error Method:
Indoor unit discharge air temp.
thermistor error
Detective Actuators:
Indoor Unit Controller PCB Circuit

Discharge air temp. thermistor

Forecast of Cause : 1. Connector defective connection 2. thermistor defective 3. Controller PCB defective
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 sensor resistance value
Sensor Characteristics (Rough value)
Temperature (
°F)
Temperature (
°C)
Resistance Value (
)
Temperature (
°F)
Temperature (
°C)
Resistance Value (
)
If Thermistor is either open or shorted, replace it and reset the power.
OK
Check Point 3 : Check voltage CN9 of Controller PCB (DC5.0V)
If the voltage does not appear, replace Controller PCB and set up the original address.
Indicate or Display:
E 4A.2
Outdoor Unit : E.5 U.1
Error Code
Detective details:
When Indoor unit discharge air temp. thermistor 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
: 4 A, 4 A. 2
59
68
77
15
20
25
15.8
12.5
10.0
04-88
+4
86
95
30
35
8.0
6.5
DC

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents