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Features MLCAC-UTSM-2011-02
42 Outdoor Units
(4) For A4 duct indoor unit
PCB display lamp indication of trouble
NO. Protection or Malfunction LED1(Red) LED2(Yellow) LED3(Green)
1 Lack of phase or the phase is wrong Flash Flash Flash
2 Compressor is in low pressure protection Flash Light Flash
3 The wired controller input is malfunction Flash Flash Light
4 T3 sensor is malfunction Extinguish Flash Flash
5 T2 sensor is malfunction Flash Extinguish Flash
6
T1 sensor is malfunction or high pressure
switch is broken
Flash Flash Extinguish
LEDs’ for the indication of outdoor trouble
Type Contents LED1 LED2 LED3
Trouble Phase sequence Flash Off Off
Trouble Lack of phase(A,B) Flash Off Off
Trouble Lack of phase(C) Off Off Off
Trouble Protection of Low pressure Flash Flash Off
Trouble Overload of current Off Off Flash
Trouble Communication malfunction Flash Off Flash
Trouble Open-circuit and short-circuit trouble of T3 Off Flash Flash
Trouble Open-circuit and short-circuit trouble of T4 Off Flash Off
Trouble High temperature protection of condenser Flash Flash Flash
Note:
1. If the LED1-LED3 are flashing slowly, means the system is stand-by.
2. T3: Outdoor condenser temperature sensor
3. T4: Outdoor ambient temperature sensor