Sensor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
Trouble shooting 25
INDOOR UNIT Error Method:
Indoor unit discharge air temp.
thermistor error (Otudoor Air unit)
Indicate or Display:
Outdoor Unit : E.5 U.1
Error Code : 4 A, 4 A. 2
Detective Actuators:
Indoor Unit Co ntroller PCB Circuit
Discharge air temp . S ensor
Detective details:
When Indoor unit discharge air temp. thermistor open or short age is detected
OK
Forecast of Cause :
1. Connector de fective connection 2. thermistor defec tive 3. Controller PCB def e ctive
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 s ensor 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.2
04-33
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