21 English
Trial operation and testing
2. Product diagnosis procedure
NOTE:
1)Turn the power OFF and then ON again if the LED display recurs, the outdoor PCB is faulty.
2)Diagnosis marked * may not apply to some cases. For details refer to the service guide.
3)Do NOT touch terminal strip and PCB assy.
1-1.
Diagnosis using LEDs
GREEN RED
Micro-computer
normal LED-A
Malfunction detected
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 over-current.
* Thermistor or CT abnormality.
High temperature switch-box.
High temperature at inverter circuit heat-sink.
* Output over-current.
* Refrigerant shortage.
Low voltage to main circuit or over voltage to main circuit.
Reversing solenoid valve switching failure. * Or high
pressure switching failure.
Faulty outdoor unit PCB.
Fan motor fault.
Wiring error -> check unfinished.
— — — — — Note 1
— — — — — * Power supply fault.
—
GREEN RED
ON OFF Flashing Any status Flashing: normal OFF: normal
L
3PEN417620-3N.book Page 21 Friday, June 21, 2019 9:50 AM
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