Toshiba MMW-AP0271LQ-E Service Manual page 48

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
E25 E25 —
Address of
outdoor unit
from which
signal is not
received
normally
E26 E26
Detected
outdoor unit No.
E28 E28
SMMS-i
(Series 4)
A3-IPDU Fan
1 2 3
01 O
02 O
03 O O
04 O
05 O O
06 O O
07 O O O
E31 E31
08
09 O
0A O
0B O O
0C O
0D O O
0E O O
0F O O O
Symbol O
signifies site of
IPDU error.
F01 — —
F02 — —
Location
Description
of
detection
I/F Duplicated
follower outdoor
address
I/F Dropping out of
outdoor unit
I/F Outdoor
follower unit
error
I/F IPDU
communication
error
IPDU
O
O
O
O
O
O
O
O
Indoor Indoor TCJ
unit sensor error
Indoor Indoor TC2
unit sensor error
Error detection
System status
condition(s)
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
error code from outdoor
follower unit.
All stop Communication is disrupted
between IPDUs (P.C.
boards) in inverter box.
Stop of Sensor resistance is infinity
corresponding unit or zero (open / short circuit).
Stop of Sensor resistance is infinity
corresponding unit or zero (open / short circuit).
– 48 –
Indoor unit (including Hot Water Module)
Check items (locations)
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-
segmentdisplay of outdoor
header unit, the fan of the
outdoor unit that has been
shut down due to an error
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.
• Check wiring and
connectors involved in
communication between
IPDU-I/F P.C. board for
bad contact or broken wire.
• Check for defect in outdoor
P.C. board (I/F, A3-IPDU
or Fan IPDU).
• Check for external noise.
• Check connection of TCJ
sensor connector and
wiring.
• Check resistance
characteristics of TCJ
sensor.
• Check for defect in indoor
P.C. board.
• Check connection of TC2
sensor connector and
wiring.
• Check resistance
characteristics of TC2
sensor.
• Check for defect in indoor
P.C. board.