2-30. E: 74. Outdoor temperature thermistor error (Outdoor unit)
Indicator
Indoor unit
Operation indicator
7 time flash
Timer indicator
4 time flash
Economy indicator
Continuous flash
Error code
E: 74
Detective actuator
Outdoor unit main PCB
When outdoor temperature thermistor open or short
circuit is detected at power on or while running the
compressor
Outdoor temperature thermistor
Forecast of cause
Connector failure
Thermistor failure
Main PCB failure
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.
↓
Check point 2. Remove connector and check thermistor resistance value
•
For the outdoor temperature thermistor resistance value, refer to
•
If thermistor is either open or shorted, replace it and reset the power.
↓
Check point 3. Check voltage of main PCB
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor
(DC 5.0 V).
NOTE:
For details of thermistor connector, refer to
TECHNICAL DATA AND PARTS LIST on page 02-117.
If the voltage does not appear, replace main PCB.
↓
End
2-30. E: 74. Outdoor temperature thermistor error (Outdoor unit)
- (03-46) -
2. Troubleshooting with error code
TROUBLESHOOTING
TROUBLESHOOTING
Summary of Contents for ABHG18KRTA
Page 4: ......
Page 5: ...1 GENERAL INFORMATION 2022 08 08 SR_CH01_MU004EG_06 ...
Page 59: ...2 TECHNICAL DATA AND PARTS LIST 2022 08 08 SR_CH02_MU004EG_11 ...
Page 62: ......
Page 213: ...3 TROUBLESHOOTING 2022 08 08 SR_CH03_MU004EG_07 ...
Page 216: ......
Page 316: ...6 2 Outdoor unit 03 100 6 Thermistor resistance values TROUBLESHOOTING TROUBLESHOOTING ...
Page 317: ...4 CONTROL AND FUNCTIONS 2022 04 13 SR_CH04_MU004EG_08 ...
Page 320: ......
Page 403: ...5 FILED WORKING 2022 08 08 SR_CH05_MU004EG_08 ...