4/8/2008R series service manual
PAGE 12 OF 20
7. Troubleshooting
7.1 Indoor unit
Failure phenomenon
Operation lamp
Timer lamp
Indoor fan speed has been out of control for over 1 minute
☆
X
Indoor room temp. Sensor or evaporator temp. Sensor is open circuit
or short circuit
☆
On
EEPROM error
On
☆
Cross zero signal error
☆
☆
r
Extinguish
☆
Flash at 5Hz
On Light
7.2 Outdoor unit (on mainboard)
7.2.1 1 drive 2
Failure phenomenon
LED1
LED2
LED3
Stand by
☆
☆
☆
High temp. protect of condenser
☆
☆
Temp. sensor in condenser 1 is open circuit or short circuit
☆
Temp. sensor in condenser 2 is open circuit or short circuit
☆
☆
Flash at 2Hz
7.2.2 1 drive 3
Failure phenomenon
LED1
LED2
LED3
Sensor in outdoor unit
High temp. protect of condenser
☆
☆
RT3B or RT3A
RT3A sensor is open circuit or short circuit
☆
RT3A
RT4 sensor is open circuit or short circuit
☆
RT4
RT3B sensor is open circuit or short circuit
☆
RT3B
☆
Flash at 2Hz
7.3
Diagnostic chart
7.3.1Indoor fan speed has been out of control for over 1 minute
