Toshiba MMK-UP0051DHPL-E(TR) Service Manual page 82

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
L29 L29
11 O
12 O
13 O O
18
19 O
1A O
1B O O
Circle (O):
Trouble
P.C. board
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
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.
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.
- 82 -
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.
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).