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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.
