Toshiba MMW-AP0271LQ-E Service Manual page 55

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
L20 — —
L28 L28 —
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
L29 L29
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.
Detected indoor
address
L30 L30
— L31 —
P01 — —
P03 P03 —
Location
Description
of
detection
AI-NET Duplicated
Indoor unit central control
address
I/F Too many
outdoor units
connected
I/F Error in No. of
IPDUs
IPDU
O
O
O
O
O
O
O
O
Indoor unit External
interlock of
indoor unit
I/F Extended IC
error
Indoor unit Indoor fan
motor error
I/F Discharge
temperature
TD1 error
Error detection
System status
condition(s)
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
corresponding unit external error input
terminal (CN80) for 1
minute.
Continued There is part failure in P.C.
operation board (I/F).
Stop of
corresponding unit
All stop Discharge temperature
(TD1) exceeds 115 ˚C.
– 55 –
Indoor unit (including Hot Water Module)
Check items (locations)
• 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.
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.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1, 2, 4) for clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for defect in 4-way
valve.
• Check for leakage of SV4
circuit.
• Check SV4 circuit (wiring
or installation error in
SV41, SV42 or SV43).