Toshiba MMY-MAP0806HT7(J)P, Service Manual

Page: 175 / 350

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
E18 – –
Indoor
unit Error in
communication
between indoor
header and
follower units Stop of
corresponding
unit Periodic communication
between indoor header and
follower units cannot be
maintained. • Check remote controller
wiring.
• Check indoor power supply
wiring.
• Check P.C. boards of
indoor units.
E19 E19
00:
No header unit
02:
Two or more header units I/F Error in number
of outdoor
header units All stop • There
are
more than one
outdoor header unit
s
in
one line.
• There is no outdoor header
unit in one line.
Outdoor header unit is
outdoor unit to which indoor-
outdoor tie cable (U1,U2) is
connected.
• Check connection of
indoor-outdoor
communication line.
• Check for defect in outdoor
P.C. board (I/F).
E20 E20
01:
Connection of outdoor unit
from other line
02:
Connection of indoor unit
from other line I/F Connection to
other line found
during
automatic
address setting All stop Equipment from other line is
found to have been
connected when indoor
automatic address setting is
in progress. Disconnect inter-line tie cable
in accordance with automatic
address setting method
explained in “Address
setting” section.
E23 E23 –
I/F Outdoor-
outdoor
communication
transmission
error All stop Signal cannot be transmitted
to other outdoor units for at
least 30 seconds
continuously. • Check power supply to
outdoor units. (Is power
turned on?)
• Check connection of tie
cables between outdoor
units for bad contact or
broken wire.
• Check communication
connectors on outdoor
P.C. boards.
• Check for defect in outdoor
P.C. board (I/F).
• Check termination
resistance setting for
communication between
outdoor units.
E25 E25 –
I/F Duplicated
follower outdoor
address All stop There is duplication in
outdoor addresses set
manually. Note:
Do not set outdoor
addresses manually.
E26 E26
Address of outdoor unit from
which signal is not received
normally I/F
Signal lack
of
outdoor unit
All stop Outdoor unit initially
communicating normally fails
to return signal for specified
length of time. • Backup setting is being
used for outdoor units.
• Check power supply to
outdoor unit. (Is power
turned on?)
• Check connection of tie
cables between outdoor
units for bad contact or
broken wire.
• Check communication
connectors on outdoor
P.C. boards.
• Check for defect in outdoor
P.C. board (I/F).
E28 E28
I/F Outdoor
follower unit
error All stop Outdoor header unit receives
error code from outdoor
follower unit. • Check check code
displayed on outdoor
follower unit.
<Convenient functions>
If SW04 is pressed and held
for at least 1 second while
[E28] is displayed on the 7-
segment display of outdoor
header unit, the fan of the
outdoor unit that has been
shut down due to an error
comes on.
If SW04 and SW05 are
pressed simultaneously, the
fans of normal outdoor units
come on.
To stop the fan or fans, press
SW05 on its own.
Detected outdoor unit No.
− 1 7 4 −