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42
Troubleshooting
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LED ON OUTDOOR UNIT PCB
3MXM, 4MXM, 5MXM series
GREEN
RED
MICROCOMPUTER
NORMAL
MALFUNCTION
DETECTION
LED-A
LED1 LED2 LED3 LED4 LED5
DIAGNOSIS
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●
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NORMAL CHECK INDOOR UNIT
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HIGH PRESSURE PROTECTOR WORKED OR FREEZE-UP IN
OPERATING UNIT OR STAND-BY UNIT
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* OVERLOAD RELAY WORKED OR HIGH DISCHARGE PIPE
TEMPERATURE
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FAULTY COMPRESSOR START
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INPUT OVERCURRENT
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* THERMISTOR OR CT ABNORMALITY
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HIGH TEMPERATURE SWITCHBOX
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HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
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* OUTPUT OVERCURRENT
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* REFRIGERANT SHORTAGE
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LOW VOLTAGE TO MAIN CIRCUIT OR MOMENTARY VOLTAGE
LOSS
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REVERSING SOLENOID VALVE SWITCHING FAILURE
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FAN MOTOR FAULT
−
−
−
−
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[NOTE 1]
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−
−
−
−
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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
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LED ON OUTDOOR UNIT PCB
2MXMseries
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 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.