Toshiba Carrier MMU-AP0071MH2UL - Page 94

94
Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check code
Sub-code
L03 – –
Indoor
unit
Duplicated
indoor header
unit
Stop of
corresponding
unit
There is more than one
header unit in group.
• Check indoor addresses.
• Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.
L04 L04 –
I/F Duplicated
outdoor line
address
All stop There is duplication in line
address setting for outdoor
units belonging to different
refrigerant piping systems.
• Check line addresses.
L05 – –
I/F Duplicated
priority indoor
unit (as
displayed on
priority indoor
unit)
All stop More than one indoor unit
has been set up as priority
indoor unit.
• Check display on priority
indoor unit.
L06 L06
No. of priority
indoor units
I/F Duplicated
priority indoor
unit (as
displayed on
indoor unit other
than priority
indoor unit)
All stop More than one indoor unit
have been set up as priority
indoor unit.
• Check displays on priority
indoor unit and outdoor
unit.
L07 – –
Indoor
unit
Connection of
group control
cable to stand-
alone indoor
unit
Stop of
corresponding
unit
There is at least one stand-
alone indoor unit to which
group control cable is
connected.
• Check indoor addresses.
L08 L08 –
Indoor
unit
Indoor group /
addresses not
set
Stop of
corresponding
unit
Address setting has not been
performed for indoor units.
• Check indoor addresses.
Note:
This code is displayed
when power is turned on
for the first time after
installation.
L09 – –
Indoor
unit
Indoor capacity
not set
Stop of
corresponding
unit
Capacity setting has not been
performed for indoor unit.
Set indoor capacity. (DN =
11)
L10 L10 –
I/F Outdoor
capacity not set
All stop Jumper wire provided on P.C.
board for servicing I/F P.C.
board has not been removed
as required for given model.
Check model setting of P.C.
board for servicing outdoor
I/F P.C. board.
L20 – –
Indoor
unit
Duplicated
central control
address
All stop There is duplication in central
control address setting.
• Check central control
addresses.
• Check network adaptor
P.C. board.
L28 L28 –
I/F Too many
outdoor units
connected
All stop There are more than four
outdoor units.
• Check No. of outdoor units
connected (Only up to 4
units per system allowed).
• Check communication
lines between outdoor
units.
• Check for defect in outdoor
P.C. board (I
/F).