Operation Manual

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40
LED ON OUTDOOR UNIT PCB 
3MXS, 4MXS, 5MXS series
GREEN RED
MICROCOMPUTER
NORMAL
MALFUNCTION
DETECTION
LED-A LED1 LED2 LED3 LED4 LED5 DIAGNOSIS
●●●●●
NORMAL CHECK INDOOR UNIT
● ●
HIGH PRESSURE PROTECTOR WORKED OR FREEZE-UP IN
OPERATING UNIT OR STAND-BY UNIT
●
●
●
∗ OVERLOAD RELAY WORKED OR HIGH DISCHARGE PIPE
TEMPERATURE
●
●
●
FAULTY COMPRESSOR START
● ● ●
INPUT OVERCURRENT
●●●
∗ THERMISTOR OR CT ABNORMALITY
● ●
HIGH TEMPERATURE SWITCHBOX
●●● ●
HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
●● ●●
∗ OUTPUT OVERCURRENT
●● ●
∗ REFRIGERANT SHORTAGE
●● ●
LOW VOLTAGE TO MAIN CIRCUIT OR MOMENTARY VOLTAGE
LOSS
●●●●
REVERSING SOLENOID VALVE SWITCHING FAILURE
●
FAN MOTOR FAULT
−−−−
●
[NOTE 1]
●
−−−−
●
POWER SUPPLY FAULT OR [NOTE 2]
NOTE: The LED5 is only available in the 5M series.
GREEN NORMALLY FLASHING
RED NORMALLY OFF
ON
FLASHING
●
OFF
−
IRRELEVANT
LED ON OUTDOOR UNIT PCB 
2MXS series
GREEN
MICROCOMPUTER NORMAL
LED-A DIAGNOSIS
NORMAL CHECK INDOOR UNIT
[NOTE 1]
●
POWER SUPPLY FAULT OR [NOTE 2]
GREEN NORMALLY FLASHING
ON
FLASHING
●
OFF
NOTE
Turn off the power and then on again. If the LED display recurs, the outdoor unit PCB is faulty.•
Diagnosis marked•
∗ Do not apply to some cases. For details, refer to the service guide.
01_EN_3P357704-1.indd 4001_EN_3P357704-1.indd 40 12/17/2013 3:22:28 PM12/17/2013 3:22:28 PM