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LED ON OUTDOOR UNIT PCB
3MXS, 4MXS, 5MXS series
LED ON OUTDOOR UNIT PCB
2MXS series
NOTE
Turn the power off 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.
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
GREEN
MICROCOMPUTER NORMAL
LED-A DIAGNOSIS
NORMAL CHECK INDOOR UNIT
[NOTE 1]
POWER SUPPLY FAULT OR [NOTE 2]
GREEN NORMALLY FLASHING
ON
FLASHING
OFF
Troubleshooting
42


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