LMAS Service Manual
Table Of Contents
- SERVICE MANUAL
- 1. GENERAL INFORMATION
- 2. TECHNICAL DATA AND PARTS LIST
- 3. TROUBLESHOOTING
- 1. Error code
- 1-1. How to check the error memory
- 1-2. How to erase the error memory
- 1-3. Error code table (Indoor unit and wired remote controller)
- 1-4. Error code table (Outdoor unit)
- 1-5. Error code table (Wireless LAN indicator)
- 1-6. Error code table (Mobile app)
- 1-7. Error message for wireless LAN control (Mobile app)
- 2. Troubleshooting with error code
- 2-1. E: 11.X. Serial communication error (Serial reverse transfer error) (Outdoor unit)
- 2-2. E: 11.X. Serial communication error (Serial forward transfer error) (Indoor unit)
- 2-3. E: 12.X. Wired remote controller communication error (Indoor unit)
- 2-4. E: 18.X. External communication error (Indoor unit)
- 2-5. E: 23.X. Combination error (Outdoor unit)
- 2-6. E: 26.X. Address setting error in wired remote controller (Indoor unit)
- 2-7. E: 29.X. Connected unit number error (Indoor unit)
- 2-8. E: 32.X. Indoor unit main PCB error (Indoor unit)
- 2-9. E: 35.X. MANUAL AUTO button error (Indoor unit)
- 2-10. E: 3A.X. Indoor unit communication circuit error (Indoor unit)
- 2-11. E: 41.X. Room temperature sensor error (Indoor unit)
- 2-12. E: 42.X. Indoor unit heat exchanger sensor error (Indoor unit)
- 2-13. E: 51.X. Indoor unit fan motor error (Indoor unit)
- 2-14. E: 58.X. Intake grille error (Indoor unit)
- 2-15. E: 62.X. Outdoor unit main PCB error (Outdoor unit)
- 2-16. E: 63.X. Inverter error (Outdoor unit)
- 2-17. E: 64.X. PFC circuit error (Outdoor unit)
- 2-18. E: 65.X. Trip terminal L error (Outdoor unit)
- 2-19. E: 71.X. Discharge thermistor error (Outdoor unit)
- 2-20. E: 73.X. Heat exchanger (Middle/Outlet) temperature thermistor error (Outdoor unit)
- 2-21. E: 74.X. Outdoor temperature thermistor error (Outdoor unit)
- 2-22. E: 77.X. Heat sink thermistor error (Outdoor unit)
- 2-23. E: 84.X. Current sensor error (Outdoor unit)
- 2-24. E: 86.X. High pressure switch error (Outdoor unit)
- 2-25. E: 86.X. Pressure sensor error (Outdoor unit)
- 2-26. E: 94.X. Trip detection (Outdoor unit)
- 2-27. E: 95.X. Compressor motor control error (Outdoor unit)
- 2-28. E: 97.X. Outdoor unit fan motor error (Outdoor unit)
- 2-29. E: 99.X. 4-way valve error (Outdoor unit)
- 2-30. E: A1.X. Discharge temperature error (Outdoor unit)
- 2-31. E: A5.X. Low pressure error (Outdoor unit)
- 2-32. E: AC.X. Heat sink temperature error (Outdoor unit)
- 3. Troubleshooting without error code
- 4. Troubleshooting with error code (For wireless LAN adapter)
- 4-1. E: 18.X. External communication error between indoor unit and WLAN adapter
- 4-2. Wireless LAN adapter error
- 4-3. Network communication error between wireless LAN router and WLAN adapter
- 4-4. E: 18.X. Communication error
- 4-5. E: 18.X. Wireless LAN adapter non-energized
- 4-6. Wireless LAN adapter Sleep mode (Indoor unit)
- 4-7. Mobile app setting method
- 5. Service parts information
- 6. Thermistor resistance values
- 1. Error code
- 4. CONTROL AND FUNCTIONS
- 1. Rotation number control of compressor
- 2. Auto changeover operation
- 3. Fan control
- 4. Louver control
- 5. Timer operation control
- 6. Defrost operation control
- 7. Various control
- 7-1. Auto restart
- 7-2. MANUAL AUTO operation
- 7-3. Forced cooling operation
- 7-4. MIN. HEAT operation
- 7-5. ECONOMY operation
- 7-6. POWERFUL operation
- 7-7. Fresh air control
- 7-8. Compressor preheating
- 7-9. External electrical heater control
- 7-10. Electronic expansion valve control
- 7-11. Prevention to restart for 3 minutes (3 minutes st)
- 7-12. 4-way valve control
- 7-13. Peak cut operation
- 7-14. Unit status monitoring and the detected value indication
- 8. Various protections
- 5. FILED WORKING
- BACK COVER
2-4. E: 18.X. External communication error (Indoor unit)
Indicator
Indoor unit
Operation indicator 1 time flash
Timer indicator 8 time flash
Economy indicator Continuous flash
Error code E: 18
outdoor unit Refer to "Error code table (Outdoor unit)" on page 03-4
Detective actuator Indoor unit
External
communication
error
After receiving a signal from the external input and
output PCB, the same signal has not been received for
15 seconds.
Forecast of cause
Connection failure
→LAN adapter failure
Main PCB
Check point 1. Check the connection
• Check any loose or removed connection between the main PCB to the →AN adapter.
-> If there is an abnormal condition, correct it by refer to the installation manual or the “DESIGN
& TECHNICAL MANUAL”.
• Check the connection condition on the →LAN adapter and the main PCB (If there is loose con-
nector, open cable or mis-wiring.)
Check point 2. Replace the →LAN adapter
If check point 1 do not improve the symptom, change →LAN adapter.
Check point 3. Replace main PCB
If check point 2 do not improve the symptom, change main PCB
End
2-4. E: 18.↓. External communication error (Indoor unit) - (03-18) - 2. Troubleshooting with error code
TROUBLESHOOTING
TROUBLESHOOTING