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Troubleshooting
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LED ON OUTDOOR UNIT PCB
3MXM series
GREEN
MICROCOMPUTER
NORMAL
LED-A
●
GREEN NORMALLY FLASHING
RED
NORMALLY OFF
ON
FLASHING
●
OFF
−
IRRELEVANT
■
LED ON OUTDOOR UNIT PCB
2MXM series
GREEN
MICROCOMPUTER NORMAL
LED-A
●
GREEN NORMALLY FLASHING
ON
FLASHING
●
OFF
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.
45
RED
MALFUNCTION
DETECTION
LED1 LED2 LED3 LED4 LED5
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NOTE: The LED5 is only available in the 5M series.
DIAGNOSIS
NORMAL
CHECK INDOOR UNIT
[NOTE 1]
POWER SUPPLY FAULT OR [NOTE 2]
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]
DIAGNOSIS
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