Toshiba MMU-UP0051MH-E(TR) Service Manual page 111

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
L10 L10 —
L20 — —
L23 — —
L28 L28 —
P.C.board
Compressor Fan Motor
1 2 1
01 O
02 O
03 O O
08 O
09 O O
0A O O
0B O O O
10
11 O
12 O
13 O O
18
19 O
L29 L29
1A O
1B O O
Circle (O):
Trouble
P.C. board
00
Detected indoor
address
L30 L30
— L31 —
P01 — —
P03 P03 —
Location
Description
of
detection
I/F Outdoor
capacity not set
Network Duplicated
adaptor central control
Indoor unit address
I/F SW setting
mistake
I/F Too many
outdoor units
connected
I/F Trouble in No.
of P.C. board
2
O
O
O
O
O
O
O
O
I/F The number of
inverter P.C.
boards is
abnormal.
Indoor unit Indoor external
interlock
(External
abnormal input)
I/F Extended IC
trouble
Indoor unit Indoor fan
motor trouble
I/F Discharge
temperature
TD1 trouble
Check code detection
System status
condition(s)
All stop Initial setting of I/F P.C.
board has not been
implemented.
All stop There is duplication in
central control address
setting.
All stop Outdoor P.C. board (I/F)
does not operate normally.
All stop There are more than 5
outdoor units.
All stop Insufficient number of P.C.
board are detected when
power is turned on.
All stop When there is much number
of an inverter P.C. board to
model setting of an interface
P.C. board.
Stop of • Indoor unit has been shut
corresponding down due to external
unit abnormal input signal.
Continued There is part failure in P.C.
operation board (I/F).
Stop of
corresponding
unit
All stop Discharge temperature
(TD1) exceeds 115 ˚C.
– 111 –
Check items (locations)
• Check model setting of
P.C. board for servicing
outdoor I/F P.C. board.
• Check central control
addresses.
• Check switch setting of
outdoor P.C. board (I/F).
• Check No. of outdoor units
connected (Only up to 5
units per system allowed).
• Check communication
lines between outdoor
units.
• Check for failure 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 compressor P.C.
board, fan P.C. board, and
I/F P.C. board for failure.
• Check I/F P.C.board
exchange has been
correctly performed as a
procedure.
• Check for failure in I/F P.C.
board.
• Check for inverter P.C.
board for compressors and
inverter P.C. board for fan.
When external device is
connected:
1) Check for trouble in
external device.
2) Check for trouble in
indoor P.C. board.
When external device is
not connected:
1) Check for trouble 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, 3, 4) for
clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for failure in 4-way
valve.
• Check for leakage of SV4
circuit.
• Check SV4 circuit (wiring
or installation trouble in
SV41 or SV42).