LED ON OUTDOOR UNIT PCB
GREEN
MICROCOMPUTER
NORMAL
LED-A
LED1 LED2 LED3 LED4
NORMALLY
GREEN
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.
2MXS, 3MXS, 4MXS, 5MXS 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 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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