LED ON OUTDOOR UNIT PCB
GREEN
MICROCOMPUTER
NORMAL
LED-A
LED1 LED2 LED3 LED4
GREEN
NORMALLY FLASHING
RED
NORMALLY OFF
ON
FLASHING
OFF
IRRELEVANT
LED ON OUTDOOR UNIT PCB
GREEN
MICROCOMPUTER
NORMAL
LED-A
NORMALLY
GREEN
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.
3MXS, 3MKS, 4MXS, 4MKS, 5MXS, 5MKS series
RED
MALFUNCTION
DETECTION
LED5
NORMAL
HIGH PRESSURE PROTECTOR WORKED OR FREEZE-UP IN OPERATING UNIT OR STAND-BY UNIT
∗
FAULTY COMPRESSOR START
INPUT OVERCURRENT
∗
HIGH TEMPERATURE SWITCHBOX
HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
∗
∗
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.
2MXS, 2MKS series
NORMAL
CHECK INDOOR UNIT
[NOTE 1]
POWER SUPPLY FAULT OR [NOTE 2]
DIAGNOSIS
CHECK INDOOR UNIT
OVERLOAD RELAY WORKED OR HIGH DISCHARGE PIPE TEMPERATURE
THERMISTOR OR CT ABNORMALITY
OUTPUT OVERCURRENT
REFRIGERANT SHORTAGE
DIAGNOSIS
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