Toshiba MMW-UP0271LQ-E - Page 57

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Check code
Location
of
detection
Description System status
Check code detection
condition(s)
Check items (locations)
• 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.
I/FDetected
outdoor unit No.
The
check
code
which
occurred
follower
outdoor
unit is
displayed
Outdoor
follower unit
trouble
All stop Outdoor header unit
receives trouble code from
outdoor follower unit.
E28
• Check wiring and
connectors involved in
communication between
P.C. board I/F P.C. board for
bad contact or broken wire.
• Check for failure in outdoor
P.C. board (I/F, comp. P.C.
board or Fan P.C. board).
• Check for external noise.
I/F
Circle (O):
Trouble
P.C. board
P.C. board
communication
trouble
All stop Communication is disrupted
between P.C. board in
inverter box.
E31 E31
• Operation of power supply
reset (OFF for 60 seconds
or more)
• Outdoor I/F PC board
trouble check
Communication
trouble between
MCU and Sub
MCU
All stop Communication between
MCU and Sub MCU
stopped.
80
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
P.C.board
Compressor Fan Motor
01
02
03
08
09
0A
0B
10
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
1212
11
12
13
18
19
1A
1B
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Note:
Do not set outdoor
addresses manually.
I/F Duplicated
follower outdoor
address
All stop There is duplication in
outdoor addresses set
manually.
E25 E25 —
• 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).
I/FAddress of
outdoor unit
from which
signal is not
received
normally
Signal lack of
outdoor unit
All stop Outdoor unit initially
communicating normally
fails to return signal for
specified length of time.
E26 E26
• 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.
Outdooroutdoor
communication
transmission
trouble
I/F All stop Signal cannot be transmitted
to other outdoor units for at
least 30 seconds
continuously.
E23 E23 —
Indoor unit (including Hot Water Module)