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
2. Auto changeover operation
When the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum
mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode
is automatically switched in accordance with temperature changes. The temperature can be set be-
tween 18°C and 30°C in 1.0°C steps.
• When operation starts, indoor fan and outdoor fan are operated for around 1 minute.
Room temperature and outdoor temperature are sensed, and the operation mode is selected in
accordance with the table below.
Room temperature Operation mode
Tr > Ts + 2°C Cooling
Ts + 2°C ≥ Tr ≥ Ts - 2°C Middle zone
Tr < Ts - 2°C Heating
Tr: Room temperature
Ts: Setting temperature
NOTE:
When the operation mode is middle zone, indoor unit operation mode is selected as below.
• Same operation mode is selected as outdoor unit.
If outdoor unit is operating in cooling and heating mode, indoor unit will be operated by
the same operation mode.
• Selected by outdoor temperature.
If outdoor unit is operating in other than cooling and heating mode, indoor unit will be op-
erated according to the outdoor temperature as below.
Outdoor temp. Operation mode
25°C or more Cooling
Less than 25°C Heating
• When the compressor was stopped for 6 consecutive minutes by temperature control function af-
ter the cooling or heating mode was selected as above, operation is switched to monitoring mode
and the operation mode selection is done again.
• When the middle zone is selected on the predetermining of the operation mode, the operation
mode before the changing to the monitoring mode is selected.
- (04-7) -
2. Auto changeover operation
CONTROL AND
FUNCTIONS
CONTROL AND
FUNCTIONS