Toshiba MMU-AP0074YH-E Service Manual page 90

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
controller
code
L10 L10 –
Target indoor
L17 L17 address
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
SMMS-i (Series 4)
L29 L29
Symbol O
signifies site of
IPDU error.
Location
AI-NET central
of Description
control
detection
remote
controller
I/F Outdoor
capacity not set
88
I/F Outdoor unit
model mismatch
error
I/F Cool / heat
switch unit error
AI-NET Duplicated
Indoor central control
98 unit address
I/F Too many
outdoor units
connected
46
I/F Error in No. of
IPDUs
CF
Error detection
System status
condition(s)
All stop Jumper wire provided on P.C.
board for servicing I/F P.C.
board has not been removed
as required for given model.
The outdoor unit model is
duplicate. The Cool/Heat
Flex series 1/2 are duplicate.
Only the target The heating operation was
unit stopped performed without the cool-
only 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.
89
Check items (locations)
Check model setting of P.C.
board for servicing outdoor
I/F P.C. board.
• Check the outdoor unit
model.
• 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 (applicable to
AI-NET).
• 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.