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Seivice diagnosis
Domestic air conditioner
35
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.
10
.3.2 EEPROM abnormal
Indoor Display E4: indoor EEPROM error
Indoor display F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times
Method of The Data detected by the MCU are used to determine MCU
Malfunction
Detection
Malfunction when the data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
Supposed
■
Faulty EEPROM data
Causes
■
Faulty EEPROM
■
Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or
parts damage may be occurred.
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
Replace the indoor or outdoor mainboard
Summary of Contents for 1U26QE4ERA
Page 14: ...Operation range Domestic air conditioner 5 Operation range 12 10 0 20 16 32 10 20 15 ...
Page 64: ...Circuit diagrams 62 Domestic air conditioner ...
Page 65: ...Circuit diagrams Domestic air conditioner 12 2 Module board Circuit Diagram 63 ...
Page 70: ...Removal Procedure 2 Removal of Electrical Box 3 Domestic Air Conditioner ...