LG Multi V ARWM072CAS5 Service Manual page 26

Function
2) Step 2 : Communication check
- If all model code is displayed in 7 segment including all Slave unit,
communication between outdoor units is normal.
- If 104* is displayed in 7-segment, check communication wires between outdoor units and DIP switch setting.
3) Step 3 : PCB error check
- After 40 seconds, error check begins.
n Master/ Slave unit
- All errors of units including Slave units are displayed in 7 segment.
- If communication between main PCB and inverter PCB isn't normal, 52* is displayed in 7-segment
If communication between main PCB and fan PCB isn't normal, 105* is displayed in 7-segment.
If error is displayed, check corresponding wires.
4) Step 4 : Auto addressing of indoor units
- Auto addressing begins when address(red) button in Main PCB is pressed for 6 seconds.
- During auto addressing, 7 segment on main PCB displays "88"
- After auto addressing, the number of indoor units is displayed in 7 segment for 30 seconds. The address of
each indoor unit is displayed on each wired remote controller.
Push address(red) button for 3 seconds.
Auto address starts
Auto address is in progress (max. 15 minutes.)
The number of indoor units is displayed for 30 seconds.
Auto address process is finished.
Every indoor unit displays its address on
wired remote controller and the 7 segment of
main PCB is off.
Communication speed setting
- Set the dip switch 3 to "On" if all the indoor units are "ARN*******4".
- Set the dip switch 3 to "Off" if not all the indoor units are "ARN*******4".
- When changing Dip switch, all power should be off and auto addressing must
be executed.
DIP Switch 7 segment
n Main PCB
SW01C ( : Confirm /
Automatic Addressing)
SW02C ( : backward)
SW03C ( : forward)
(35 indoor units found)
SW04C (X : cancel)
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DIP-SW 01
SW04D (reset)
7 - Segment