39
Troubleshooting
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
1. Turn the power off and then on again. If the LED display recurs, the outdoor unit PCB is faulty.
2. Diagnosis marked
* Do not apply to some cases. For details, refer to the service guide.
01_EN_3P276869-1A.indb 3901_EN_3P276869-1A.indb 39 8/8/2012 4:18:36 PM8/8/2012 4:18:36 PM
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