Toshiba MMD-UP0721HFP Series Service Manual page 75

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
E19 E19
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
Location
Description System status
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
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Check code detection
Check items (locations)
condition(s)
• Combined capacity of • Check capacities of indoor
units connected.
indoor units is too large.
• Check combined HP
Exceeds the total capacity of outdoor units X α %
capacities of indoor units.
α %
• Check HP capacity
SMMS-u series 115
settings of outdoor units.
Other than SMMS-u series 105
• Check No. of indoor units
connected.
Note:
• Check for failure in outdoor
If this code comes up after
P.C. board (I/F).
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 • Check remote controller
between indoor header and wiring.
follower units cannot be • Check indoor power supply
maintained. wiring.
• Check P.C. boards of
indoor units.
• There are more than one Outdoor header unit is
outdoor header units in outdoor unit to which indoor-
one line. outdoor tie cable (U1,U2) is
• There is no outdoor header connected.
unit in one line. • Check connection of
indoor-outdoor
communication line.
• Check for failure in outdoor
P.C. board (I/F).
Equipment from other line is Disconnect inter-line tie
found to have been cable in accordance with
connected when indoor automatic address setting
automatic address setting is method explained in
in progress. "Address setting" section.
Signal cannot be transmitted • Check power supply to
to other outdoor units for at outdoor units. (Is power
least 30 seconds turned on?)
continuously. • 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.
There is duplication in Note:
outdoor addresses set Do not set outdoor
manually. addresses manually.
Outdoor unit initially • Backup setting is being
communicating normally used for outdoor units.
fails to return signal for • Check power supply to
specified length of time. 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).