Toshiba MMY-MUP0721FT6P-UL Service Manual page 216

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
02: Indoor
L24 L24
units
operation
mode priority
setting
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
O
18
L29 L29 19 O O
1A O O
1B O O O
Circle (O):
Trouble P.C. board
00
Location
Description
of
detection
FS unit(s)
I/F
setting
trouble
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.
Check code detection
System status
condition(s)
Priority setting has not
All stop
been performed for indoor
units
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.
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Check items (locations)
• Check indoor units
operation mode priority
setting.
• Check outdoor unit 7
segment monitor.
• 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