Toshiba MMD-AP0726HP-UL, Service Manual

Page: 67 / 96

Check code
Location
of
detection
Description System status
Trouble
detection
condition(s)
Check items (locations)
Main
remote
control
Outdoor 7-segment display
Check
code
Sub-code
L03 – –
Indoor
unit Duplicated
indoor header
unit Stop of
corresponding
unit There
are
more than one
header unit
s
in group.
•
• Check indoor addresses.
Check for any change
made to remote contro
l
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
s
have
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
s
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 – –
Network
adaptor
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
three
outdoor units.
• Check No. of outdoor units
connected (Only up to
3
units per system allowed).
• Check communication
lines between outdoor
units.
• Check for defect in outdoor
P.C. board (I/F).
Check switch setting of
Bit 3 and 4 of SW17 in
outdoor P.C. board (I/F) .
Outdoor P.C. board (I/F)
does not operate normally.
All stop
SW setting
mistake
I/F
– – L2
3
•
L0
2
L0
2
–
Indoor
unit
Outdoor units
model
disagreement
trouble
Stop of
corresponding
unit
In case of different outdoor
unit (Not corresponded to
Air to Air Heat Exchanger
type)
•
Check outdoor unit model.
(Check whether the
outdoor unit corresponds
to Air to Air Heat
Exchanger type or not.)
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