Toshiba MML-AP0124H2UL Service Manual page 59

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
control
code
00:
Overloading
01-:
No. of units connected
E16 E16
E18 — —
00:
No header unit
02:
Two or more header
E19 E19
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
of
Description System status
detection
I/F Too many All stop
indoor units
connected
Indoor Trouble in Stop of
unit communication corresponding
between indoor unit
header and
follower units
I/F Trouble in All stop
number of
outdoor header
units
I/F Connection to All stop
other line found
during
automatic
address setting
I/F Outdooroutdoor All stop
communication
transmission
trouble
I/F Duplicated All stop
follower outdoor
address
I/F Signal lack of All stop
outdoor unit
I/F Outdoor All stop
follower unit
trouble
Trouble detection
condition(s)
• Combined capacity of indoor units
exceeds 135% of combined
capacity of outdoor units.
Note:
If this code comes up after
backup setting for outdoor unit
failure is performed, perform
"No overloading detected"
setting.
<"No overloading detected" setting
method>
Turn on SW09/Bit 2 on I/F
P.C. board of outdoor header
unit.
• More than 64 indoor units are
connected.
Periodic communication between
indoor header and follower units
cannot be maintained.
• There are more than one outdoor
header units in one line.
• There is no outdoor header unit in
one line.
Equipment from other line is found
to have been connected when
indoor automatic address setting is
in progress.
Signal cannot be transmitted to
other outdoor units for at least 30
seconds continuously.
There is duplication in outdoor
addresses set manually.
Outdoor unit initially
communicating normally fails
to return signal for specified
length of time.
Outdoor header unit receives
trouble code from outdoor follower
unit.
– 59 –
Check items (locations)
• Check capacities of indoor units
connected.
• Check combined HP capacities of
indoor units.
• Check HP capacity settings of
outdoor units.
• Check No. of indoor units
connected.
• Check for defect in outdoor P.C.
board (I/F).
• Check remote control wiring.
• Check indoor power supply wiring.
• Check P.C. boards of indoor units.
Outdoor header unit is
outdoor unit to which indooroutdoor
tie cable (U1,U2) is
connected.
• Check connection of indoor-
outdoor communication line.
• Check for defect in outdoor P.C.
board (I/F).
Disconnect inter-line tie cable 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 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.
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 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 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 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.