Service Manual
Table Of Contents
- SERVICE MANUAL
- 1. GENERAL INFORMATION
- 2. TECHNICAL DATA AND PARTS LIST
- 3. TROUBLESHOOTING
- 1. Error code
- 2. Troubleshooting with error code
- 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit)
- 2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit)
- 2-3. E: 12. Wired remote controller communication error (Indoor unit)
- 2-4. E: 18. External communication error (Indoor unit)
- 2-5. E: 32. Indoor unit main PCB error (Indoor unit)
- 2-6. E: 35. MANUAL AUTO button error (Indoor unit)
- 2-7. E: 41. Room temperature sensor error (Indoor unit)
- 2-8. E: 42. Indoor unit heat exchanger sensor error (Indoor unit)
- 2-9. E: 51. Indoor unit fan motor error (Indoor unit)
- 2-10. E: 58. Intake grille error (Indoor unit)
- 2-11. E: 62. Outdoor unit main PCB error (Outdoor unit)
- 2-12. E: 63. Inverter error (Outdoor unit)
- 2-13. E: 64. PFC circuit error (Outdoor unit)
- 2-14. E: 71. Discharge thermistor error (Outdoor unit)
- 2-15. E: 73. Outdoor unit heat exchanger thermistor error (Outdoor unit)
- 2-16. E: 74. Outdoor temperature thermistor error (Outdoor unit)
- 2-17. E: 84. Current sensor error (Outdoor unit)
- 2-18. E: 94. Trip detection (Outdoor unit)
- 2-19. E: 95. Compressor motor control error (Outdoor unit)
- 2-20. E: 97. Outdoor unit fan motor error (Outdoor unit)
- 2-21. E: 99. 4-way valve error (Outdoor unit)
- 2-22. E: A1. Discharge temperature error (Outdoor unit)
- 3. Troubleshooting without error code
- 4. Troubleshooting with error code (For wireless LAN adapter)
- 4-1. E: 18. 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. Communication error
- 4-5. E: 18. 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
- 4. CONTROL AND FUNCTIONS
- 1. Compressor frequency control
- 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. 10 °C HEAT operation
- 7-5. ECONOMY operation
- 7-6. POWERFUL operation
- 7-7. Compressor preheating
- 7-8. Electronic expansion valve control
- 7-9. Prevention to restart for 3 minutes (3 minutes st)
- 7-10. 4-way valve control
- 7-11. Outdoor unit low noise operation
- 8. Various protections
- 5. FILED WORKING
4-4. E: 18. Communication error
Indicator
Indoor unit
Operation indicator 1 time flash
Timer indicator 8 time flash
Economy indicator Continuous flash
Error code E: 18
Wireless LAN
adapter
LED1 (green) Flashing fast
LED2 (orange) Flashing fast
Detective actuator
Wireless LAN router When the external communication error between indoor
unit and WLAN adapter and network communication
error between wireless LAN router and WLAN adapter
has occurred simultaneously.
NG
Controller
PCB
NG
NG
Wireless LAN adapter PCB
Indoor unit controller PCB
Forecast of cause
Connection cable failure of wireless LAN router
Wireless LAN router failure
Connection between indoor unit and wireless LAN
adapter failure
Connection between wireless LAN adapter and wireless
LAN router failure
Wireless LAN adapter PCB failure
Controller PCB failure
Check point 1. Check the connection cable
Check the connection cable on the wireless LAN router.
-> If there is loose connector, open cable or mis-wiring, correct it.
↓
Check point 2. Check the connection status.and transmission state
• Check the connection status to the internet and wireless LAN router.
-> If the wireless LAN router is not connected to the internet, check the transmission between
wireless LAN products (ex. PC or game console, etc.) other than air conditioner and wireless
LAN router.
If no, go to "Check point 4".
• Check the wireless transmission state of wireless LAN router (LED status).
-> If the wireless transmission from the wireless LAN router has not been outgoing, inquire to
wireless LAN router maker.
If the display pattern is changed as follows, go to "Check point 3-2".
– LED 1 (green): flashing fast
– LED 2 (orange): on
If no, go to "Check point 3-1".
↓
4-4. E: 18. Communication error - (03-55) - 4. Troubleshooting with error code (For wireless LAN adapter)
TROUBLESHOOTING
TROUBLESHOOTING