Toshiba MMU-AP0074YH-E(-TR) Service Manual page 88

Check code
Outdoor 7-segment display
Main
remote
Check
controller
Sub-code
code
L18 L18 —
L20 — —
L28 L28 —
SMMS (Series 1)
01: A3-IPDU1
error
02: A3-IPDU2
error
03: A3-IPDU1/
A3-IPDU2 error
04: Fan IPDU
error
05: A3-IPDU1 +
Fan IPDU error
06: A3-IPDU2 +
Fan IPDU error
07: All IPDU
error or
Communication
error between
IPDU and I/F
circuit board or
Outdoor I/F
circuit board error
L29 L29
SMM-i (Series 4)
A3-IPDUFan
IPDU
1 2 3
01
O
02 O
03
O O
04
O
05
O O
06
O O
07
O O O
08 O
09 O
O
0A O
O
0B
O O O
0C
O O
0D
O O O
0E O O O
0F O
O O O
80
Symbol O
signifies site of
IPDU error.
Detected indoor
address
L30 L30
— L31 —
P01 — —
Location
of
Description
detection
I/F Cool / heat switch
unit error
Indoor unit Duplicated central
control address
I/F Too many outdoor
units connected
I/F Error in No. of
IPDUs
Indoor unit External interlock
of indoor unit
I/F Extended IC error Continued
Indoor unit Indoor fan motor
error
Error detection
System status
condition(s)
Only the target The heating operation was
unit stopped performed without the coolonly
setting configured in a cool-
only room where a cool / heat
switch unit is not connected.
All stop There is duplication in central
control address setting.
All stop There are more than four
outdoor units.
All stop Insufficient number of IPDUs
are detected when power is
turned on.
Stop of • Signal is present at external
corresponding unit error input terminal (CN80)
for 1 minute.
There is part failure in P.C.
operation board (I/F).
Stop of
corresponding unit
– 88 –
Check items (locations)
• Check the remote controller setting.
(DN="0F")
• Check the cool / heat switching unit.
• Check the piping connection of the
switching unit.
(Miswiring of discharge gas /
suction gas)
• Check the SVS / SVD valve
miswiring / misinstallation.
• Check central control addresses.
• Check network adaptor P.C. board.
• Check No. of outdoor units
connected (Only up to 4 units per
system allowed).
• Check communication lines
between outdoor units.
• Check for defect in outdoor P.C.
board (I/F).
• Check model setting of P.C. board
for servicing outdoor I/F P.C. board.
• Check connection of UART
communication connector.
• Check A3-IPDU, fan IPDU, and I/F
P.C. board for defect.
When external device is connected
to CN80 connector:
1) Check for defect in external device.
2) Check for defect in indoor P.C.
board.
When external device is not
connected to CN80 connector:
1) Check for defect in indoor P.C.
board.
Check outdoor P.C. board (I/F).
• Check the lock of fan motor
(AC fan).
• Check wiring.