10 Troubleshooting
Checking procedure for main parts
SMGB0136 rev.0 - 07/2021
317
10
Printed circuit board for control: PCB1
LED10
LED1
LED6
LED8
LED11LED2LED3LED4LED9
LED7
LED5
Part name Contents of functions
LED1 (Red)
Power source indicator for main control of the PCB1 (5V).
Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF.
LED2 (Red) It indicates: “Alarm”.
LED3 (Yellow) It indicates: “Alarm”.
LED4 (Green) It indicates: “Alarm”.
LED5 (Red)
Indicator for DC Bus Voltage
Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF.
LED6 (Red)
Power source indicator for Precharge Relay.
Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF.
LED7 (Green)
Power source indicator for inverter control of the PCB1 (3.3V).
Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF.
LED8 (Red)
Power source indicator for Main Relay.
Normal condition: Activated / ON. Abnormal condition: Deactivated / OFF.
LED9 (Orange) It indicates: “Alarm”.
LED10 (Yellow)
It indicates the communication state between the indoor unit and outdoor unit.
Normal condition: Activated / Flash. Abnormal condition: Deactivated / OFF.
LED11 (Green)
It indicates the communication state between the main control and inverter control of PCB1.
Normal condition: Activated / Flash. Abnormal condition: Deactivated / OFF.
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