Service diagnosis
33
Domestic air conditioner
10.3.1 Thermistor or Related Abnormality
Indoor Display
ƾƵƵ
E1: Room temperature sensor failure
ƾƶƶ
E2: Heat-exchange sensor failure
Outdoor display LED1 flash 10 times
˖
Defrost temperature sensor failure
LED1 flash 11 times
˖
Suction temperature sensor failure
LED1 flash 12 times
˖
Ambient temperature sensor failure
LED1 flash 13 times
˖
Discharge temperature sensor failure
Method of The temperatures detected by the thermistors are used to determine thermistor errors
Malfunction
Detection
Malfunction When the thermistor input is more than 4.92V or less than 0.08V during compressor
Decision operation.
Conditions
z
Note: The values vary slightly in some models
Supposed
Ŷ
Faulty connector connection
Causes
Ŷ
Faulty thermistor
Ŷ
Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
else parts damage may be occurred.
Thermistor resistance check method:
Remove the connector of the thermistor on the PCB, and measure the resistance of thermistor using tester.The
relationship between normal temperature and resistance is shown in the value of indoor thermistor.
Thermistor resistance check
Is it normal?
Yes
NO
Yes
Is it normal?
NO
Check the connector connection.
Replace the thermistor
Replace the indoor unit PCB
Correct the connection
Summary of Contents for 1U35YEFFRA-C
Page 11: ...Pinping diagrams Domestic air conditioner 4ˊPiping diagrams 9 ...
Page 12: ...Operation range 10 Domestic air conditioner 5 Operation range 10 0 21 27 35 20 40 60 43 20 40 ...
Page 14: ...Functions and control 13 Domestic air conditioner Wiring diagrams OUTDOOR UNIT ...
Page 37: ...Service diagnosis 37 Domestic air conditioner ...
Page 56: ...57 Do C omestic air ircuit Diagra conditioner ams r ...
Page 59: ...Removal Procedure 1 Removal of Outdoor panel RPHVWLF LU RQGLWLR ...
Page 60: ...Removal Procedure 2 Domestic Air Condition ...
Page 61: ...4 Removal Procedure 3 Domestic Air Condition ...
Page 62: ...Removal Procedure 2 Removal of Electrical Box RPHVWLF LU RQGLWLR ...
Page 63: ...Removal Procedure 3 Removal of Fan and Fan Motor RPHVWLF LU RQGLWLR ...
Page 64: ...Removal Procedure 4 Removal of fan motor brcked and partition RPHVWLF LU RQGLWLR ...
Page 65: ...Removal Procedure 7 Domestic Air Condition ...
Page 66: ...Removal Procedure 5 Removal of compressor and heat exchanger RPHVWLF LU RQGLWLR ...