7 | Commissioning
Installer reference guide
59
3(A)MXM+3(A)MXF+4MXM+5MXM
R32 Split series
4P600463-1B – 2020.05
Red LED
(a)
Diagnosis
1 2 3 4 5
Input over-current.
Thermistor or CT abnormality.
(b)
High temperature switch-box.
High temperature at inverter circuit heat sink.
Output over-current.
(b)
Refrigerant shortage.
(b)
Low voltage to main circuit or over voltage to main circuit.
Reversing solenoid valve switching failure or high-pressure
switching failure.
(b)
Faulty outdoor unit PCB.
Fan motor fault.
Wiring error
▪ Check wiring.
(a)
The number of LEDs displayed depends on the number of rooms.
(b)
Diagnosis may not apply to some cases. For more details, refer to the service manual.
Green LED-A Diagnosis
Normal.
▪ Check the indoor unit.
Turn the power OFF and back ON, and check the LED
within approximately 3 minutes. If the LED is ON again,
the outdoor unit PCB is faulty.
Power supply fault.
(a)
(a)
Diagnosis may not apply to some cases. For more details, refer to the service manual.
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