24
TROUBLESHOOTING
Fault code
For ease of service, the indoor unit is equipped with diagnostic code display LEDs in the indoor units. This diagnostic display is a
combination of flashing LEDs on the display panel or the front of the unit. If possible, always check the diagnostic codes displayed on the
indoor unit. The diagnostic codes displayed in the indoor unit are listed in Table 21. Once a failure occurs with the indoor unit in operation,
the green LED on the indoor unit flashes at intervals of 0.5 seconds. The fault code is deduced from the number of times the green LED
flashes, blocking unit operation. Between one flash cycle and the next one, a pause of 3 to 4 seconds elapses.
Table 22 – Fault Codes
NO.
MALFUNCTION
RUNNING LAMP
TIMER LAMP
DEFROSTING
LAMP
ALARM LAMP
DISPLAY
(DIGITAL TUBE)
1
Open or short circuit of T1
temperature sensor
X
☆
X
X
E2
2
Open or short circuit of T2
temperature sensor
☆
X
X
X
E3
3
Indoor EEPROM
☆
☆
X
X
E7
4
Water---level alarm
X
X
X
☆
E8
5
Refrigerant leakage detection
☆
X
X
☆
EC
NOTE
:
O (on) X(off)
☆
(flash at 5Hz)
◎
(flash at 0.5Hz)
Using the Emergency Button
The Emergency button is for use by a qualified service technician only. The Emergency button is for use when the room controller is
inoperative. Use a small screwdriver to press the emergency button through the metal protection grille.
Access Manual Operation by pressing manual button on the display panel. Press the manual button repeatedly to change modes as follows:
S
Once = AUTO mode [heat, cool or fan, 24
_
C and auto fan speed.]
S
Twice = COOLING mode [switches to AUTO mode after 30 minutes (mainly used for trial operation)]
S
Three times = OFF
