3-8
SM-18006
TROUBLESHOOTING
Part Name Function Information
LEDs
LED1 (Red)
Power Supply Indicator for Water Source Unit PCB (Low Voltage)
Normal Condition: Activated / ON
Abnormal Condition: Deactivated / OFF
LED2 (Green)
This LED2 indicates the communication state between the water source unit
PCB and inverter PCB.
Normal Condition: Flashing
Abnormal Condition: Activated / ON or Deactivated / OFF
LED3 (Yellow)
This LED3 indicates the communication state between the indoor unit and
water source unit.
Normal Condition: Flashing
Abnormal Condition: Activated / ON or Deactivated / OFF
LED4 (Orange)
This LED4 indicates the communication state between the water source units.
Normal Condition: Flashing
Abnormal Condition: Activated / ON or Deactivated / OFF
LED5 (Red)
Power Supply Indicator for Water Source Unit PCB (High Voltage)
Normal Condition: Activated / ON
Abnormal Condition: Deactivated / OFF
SEGs SEG1, SEG2
These indicate: “Alarm”, “Protective Safety Device has Tripped” or “Checking
Items”.
b. Inverter Printed Circuit Board for 208/230V Type: INV1, 2 (Inverter PCB) and
MPB1, 2 (Main Power PCB)
DSW101
PV151 (INV1,2) PV153 (MPB1,2)
LED202
LED203
LED501
Part Name Function Information
LED501 (Red)
(on MPB1, 2)
Power Supply Indicator for Inverter PCB
Normal Condition: Activated / ON
Abnormal Condition: Deactivated / OFF
LED202 (Yellow)
(on INV1, 2)
This indicates the state of the microcomputer.
Normal Condition: Activated / ON
Abnormal Condition: Deactivated / OFF
LED203 (Green)
(on INV1, 2)
This indicates the state of communication between inverter PCB and fan
controller. (Not Used)
Normal Condition: Activated / ON
Abnormal Condition: Deactivated / OFF
INV1 INV2
123
ON
OFF
456
123
ON
OFF
456
• DSW101
No setting is required.
When setting the No.1 pin to ON, the electric current
detection is canceled.
The No.1 pin should be set back to OFF after electrical
work.
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