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8 Troubleshooting
d. Printed circuit board (PCB) of CH unit
By the LED on the PCB in the CH unit, the condition of the expansion valve and alarm information can be checked.
LED4
LED5
LED6
LED7
1) The table below indicates the LED condition for each expansion valve when performing normal operation.
Part name
LED4 (Green)
LED5 (Green)
LED6 (Green)
LED7 (Green)
2) When alarming, the alarm code is indicated by LED.
LED
4
5
6
O
O
X
X
X
O
O
O
O
O
O
O
X
O
O
O: Flashing (Turn ON; 0.5 sec. / Turn OFF; 0.5 sec.)
X: Turn OFF.
261
SMGB0065 rev. 1 - 12/2010
PCB - CH Unit
Expansion valve
MVD2
MVD1
MVS2
MVS1
Alarm code
7
X
03
Abnormal transmission between CH unit and outdoor unit.
O
03
Abnormal transmission between CH unit and indoor unit.
O
C1
2 or more CH units are connected between outdoor unit and indoor unit.
X
C2
9 or more indoor units connected to CH unit.
X
C3
The indoor units of different refrigerant cycle is connected to CH unit.
Contents of functions
Fully opened (480 pulse): Turn ON
Fully closed (0 pulse): Turn OFF
Fully opened (600 pulse): Turn ON
Fully closed (0 pulse): Turn OFF
Fully opened (480 pulse): Turn ON
Fully closed (0 pulse): Turn OFF
Fully opened (600 pulse): Turn ON
Fully closed (0 pulse): Turn OFF
Contents
8
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Troubleshooting
