Sensor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
Trouble shooting 24
INDOOR UNIT Error Method:
Indoor unit suction air temp.
thermistor error (Outdoor Air unit )
Indicate or Display:
Outdoor Unit : E.5 U.1
Error Code : 4 A, 4 A. 1
Detective Actuators:
Indoor Unit Con troller PCB Circuit
Suction air temp. Sensor
Detective details:
When Indoor unit suc tion air temp. ther mistor open or shortage is detected
OK
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 c onnector and chec k sensor resistance value
Check Point 3 : Check voltage CN9 of Controller PCB (DC5.0V)
DC
If the voltage does not appear, replace Controller PCB and set up the original address.
6.5
35
8.0
30
10.012.515.820.125.233.6
Resistance Value ( )
0 5 01 51 02 52
Temperature (
°C)
3.54.35.3
04 54 05
Resistance Value ( )
Temperature (°C)
E.4.A.1
04-32
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