Toshiba MMW-AP0481CHQ-E Service Manual page 53

Check code
Outdoor 7-segment display
Main
remote
Check
controller Sub-code
code
E17 — —
E18 — —
00:
No header unit
02:
E19 E19
Two or more header
units
01:
Connection of outdoor
unit from other line
E20 E20
02:
Connection of indoor
unit from other line
E23 E23 —
E25 E25 —
Address of outdoor unit
from which signal is not
received normally
E26 E26
Detected outdoor unit
No.
E28 E28
Location
Description
of
detection
Indoor unit Indoor units(s)
-FS unit(s)
communication
trouble
Indoor unit Trouble in
communication
between indoor
header and
follower units
I/F Trouble in
number of
outdoor header
units
I/F Connection to
other line found
during automatic
address setting
I/F Outdooroutdoor
communication
transmission
trouble
I/F Duplicated
follower outdoor
address
I/F Signal lack of
outdoor unit
I/F Outdoor follower
unit trouble
Check code detection
System status
condition(s)
Stop of There is no
corresponding communication from
unit (s) FS unit (s)
Stop of Periodic communication
corresponding between indoor header
unit and follower units cannot
be maintained.
All stop • There are more than
one outdoor header
units in one line.
• There is no outdoor
header unit in one line.
All stop Equipment from other
line is found to have been
connected when indoor
automatic address setting
is in progress.
All stop Signal cannot be
transmitted to other
outdoor units for at least
30 seconds continuously.
All stop There is duplication in
outdoor addresses set
manually.
All stop Outdoor unit initially
communicating normally
fails to return signal for
specified length of time.
All stop Outdoor header unit
receives check code
from outdoor follower
unit.
– 53 –
Check items (locations)
• Check order in which power was
turned on.
• Check indoor unit(s)-FS unit (s)
cable
• Check remote controller wiring.
• Check indoor power supply wiring.
• Check P.C. boards of indoor units.
Outdoor header unit is
outdoor unit to which indoor-outdoor
wiring (U1,U2) is connected.
• Check connection of indoor-
outdoor communication line.
• Check for trouble in outdoor P.C.
board (I/F).
Disconnect inter-line wiring in
accordance with automatic address
setting method explained in
"Address setting" section.
• Check power supply to outdoor
units. (Is power turned on?)
• Check connection of wiring
between outdoor units for bad
contact or broken wire.
• Check communication connectors
on outdoor P.C. boards.
• Check for trouble in outdoor P.C.
board (I/F).
• Check termination resistance
setting for communication between
outdoor units.
Note:
Do not set outdoor addresses
manually.
• Backup setting is being used for
outdoor units.
• Check power supply to outdoor
unit. (Is power turned on?)
• Check connection of wiring
between outdoor units for bad
contact or broken wire.
• Check communication connectors
on outdoor P.C. boards.
• Check for trouble in outdoor P.C.
board (I/F).
• 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 a trouble 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.