Toshiba MMU-UP0051MH-E(TR) Service Manual page 105

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
00:
Capacity over
01-:
No. of units
connected
E16 E16
E18 — —
00:
No header unit
02:
Two or more
header units
E19 E19
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
Location
Description
of
detection
I/F Too many All stop
indoor units
connected
Indoor unit Trouble in Stop of
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
– 105 –
Check code detection
System status
condition(s)
• Combined capacity of
indoor units is too large.
Note:
If this code comes up
after backup setting for
outdoor unit failure is
performed, perform "No
capacity over detected"
setting.
<"No capacity over detected"
setting method>
Turn on SW103 / Bit 3 on I/F
P.C. board of outdoor header
unit.
For Cooling Only model,
this check code is not
displayed even if it exceeds
the combined capacity of
indoor units.
• More than 128 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.
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 failure in outdoor
P.C. board (I/F).
• Check remote controller
wiring.
• Check indoor power supply
wiring.
• Check P.C. boards of
indoor units.
The outdoor unit which
turned on SW101 and the
bit 1 of the interface P.C.
board is set to Header unit.
• Check SW101 bit 1 of
follower outdoor unit.
• Check connection of
indoor-outdoor
communication line.
• Check for failure in outdoor
P.C. board (I/F).
Check whether the outdoor
unit of other systems or the
indoor unit is connected to
Uv (U1/U2) line or Uc
(U5/U6) line.
• 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 failure 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 failure in outdoor
P.C. board (I/F).