LG multi V PLUS, Service Manual

Page: 276 / 373

276 Trouble Shooting Guide
Self-diagnosis function
Trouble shooting Flow
Fault diagnosis and Trouble shooting guide
51
Error Item
Error
Display No.
Major Error Occurrence Cause Meaning
Excessive capacity of
indoor units Excessive connection
of indoor units
compared to capacity
of outdoor unit
• Excessive connection of indoor units
compared to capacity of outdoor unit
• Wrong setting of sub unit
• Communication cables are not connected
between outdoor units
• Poor communication between outdoor units
No
Check the sum of indoor unit capacities
or check the connected model
Yes
No
Modify wiring
No
Modify settings of sub units
No
• If no LED5 of sub units blinks,
replace the PCB of main unit.
• If some LED5's of sub units don't
blink, replace the PCB of
corresponding sub unit.
Check communication lines
of indoor units
Does the main unit recognize
all sub unit? Check at the initial
setting display mode
Communication cables are
Connected between outdoor units?
Yes
Are the numbers of sub units
set as 1, 2, and 3, respectively?
Yes
Yes
Do LED5's of all
sub unit blink?