Toshiba MMU-UP0071MH-UL Service Manual page 90

Check code
Outdoor 7-segment display
Sub-code
L11 Detected indoor unit address
01 : Flow Selector (FS) unit (s)
L12
installation trouble"
L13 Detected indoor unit address
L17 –
Detected indoor unit address
L18
02: Switch setting trouble of
L23
outdoor unit
01: Duplication of FS units address
FS unit(s) setting trouble
L24
02: Indoor units operation
mode priority setting
L28 –
P.C.board
Compressor Fan Motor Compressor Fan Motor
1 2 1 2 1
01 O 11 O
02 O 12
03 O O 13 O
08 O 18
L29
09 O O 19 O
0A O O 1A
0B O O O 1B O
10 O
Circle (O): Trouble P.C. board
00
L30 Detected indoor unit No.
P03 –
01: Compressor 1
P04
02: Compressor 2
00: Power detection trouble
01: Open phase
P05
02: Power supply miswiring
00 : Compressor 1 or 2 heat sink trouble
01 : Compressor 1 heat sink trouble
02 : Compressor 2 heat sink trouble
P07
04: Heat sink dewing
P10 Indoor unit No. detected
P11 –
P13 –
P14 01: Outdoor unit valve is close
01: TS condition
P15
02: TD condition
Display of receiving unit
Central Indicator light block
control or
main remote
Operation Timer Ready
controller
display
L11
L12
L13
L17
L18
L23
L24
L28
P.C.board
2 1 2
O
O O
O O
L29
O O
O O
O O O
O O O
L29
(L30)
P03
P04
P05
P07
(P10)
P11
P13
P14
P15
Typical problem site
Flash
Flow Selector unit or
Shutoff Valve unit
SIM
installation trouble
Flow Selector (FS) unit(s)
SIM
system trouble
Safety measures setting
SIM
unmatched
Outdoor model
SIM
incompatibility trouble
Cooling/heating FS unit
SIM
trouble
SIM SW setting trouble
SIM FS unit(s) setting trouble
Too many outdoor units
SIM
connected
Trouble in number of
SIM
P.C. boards
The number of P.C. board
SIM
trouble
Indoor external trouble
SIM
input (interlock)
Outdoor discharge (TD1)
ALT
temperature trouble
Activation of high-pressure
ALT
SW
Power detection trouble
/Open phase detection
ALT
/Power supply miswiring
detection
Heat sink overheating
trouble
ALT
Heat sink dewing trouble
ALT Indoor unit overflow
Outdoor heat exchanger
ALT
freeze trouble
Outdoor liquid backflow
ALT
detection trouble
Another refrigerant cycle
ALT
protection
ALT
Gas leak detection
– 90 –
Description of check code
• Flow Selector unit is not connected to indoor
unit and it is not set to "Cooling only" (Heat
Recovery only)
• Flow Selector unit P.C. board trouble
• Communication connection trouble between
Flow Selector unit and indoor unit.
FS unit(s) outside the application setting
• No indoor unit is connected to No.1 port of Flow
Selector unit Multi-port type.
• A number that is one larger than the "port
address" of the indoor unit for which "Combining
branches of Flow Selector unit" is set.
(Example; If the "port address" of the indoor unit
for which "Flow Selector unit branch combination"
is set to 3, 4 must not be set.)
• Multiple remote control groups are set to one
port of the Flow Selector unit, and different port
address is set for one of the groups.
• Same address is set for different Flow Selector
units.
Outdoor unit that cannot be connected is
connected.
Cooling/heating cycle trouble resulting from piping
trouble is detected
Switch setting trouble of outdoor units when
HWM (Hot water module) is connected.
• FS unit(s) detects address identical to its own.
• Duplicated priority indoor units operation mode.
More than six outdoor units have been
connected.
There are insufficient number of P.C. board in
inverter box.
When there is much number of an inverter P.C.
board to model setting of an interface P.C. board.
Indoor unit has been shut down for external
trouble input in one refrigerant line (detected by
indoor unit).
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
High-pressure SW is activated.
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
Temperature sensor built into IPM (TH) detects
overheating.
Outdoor liquid temperature sensor (TL2) has
detected abnormally low temperature.
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
Remaining frost on outdoor heat exchanger
has been detected repeatedly.
State of refrigerant cycle circuit indicates liquid
backflow operation.
Outdoor unit valve is forget to open during test run.
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
FS unit: Flow Selector unit