Toshiba MMY-MUP0961HT6P-UL Service Manual page 194

Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
P20 P20 —
1∗: Fan P.C.
board 1
2∗: Fan P.C.
board 2
P22 P22
1∗: Compressor
1 side
P25
P25
2∗: Compressor
2 side
1∗: Compressor
1 side
2∗: Compressor
2 side
P26 P26
1∗: Compressor
1 side
2∗: Compressor
P29 P29
2 side
Differs according to
nature of alarm-causing
trouble
P30
(L20 displayed.)
P31 — —
S01 — —
Location
Description System status
of
detection
I/F Activation of All stop
high-pressure
protection
Fan INV. Outdoor fan All stop
P.C. board P.C. board
trouble
Compressor
Compressor All stop
P.C.board
P.C. board
trouble
Compressor
Compressor All stop
Start up
P.C. board
trouble
Compressor Compressor All stop
P.C. board position
detection circuit
trouble
Central Group control Continued
control follower unit operation
device trouble
Duplicated Continued
central control operation
address
Indoor unit Other indoor Stop of
trouble corresponding
(group follower unit
unit trouble)
Central Central control Continued
control device reception operation
device trouble
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Check code detection
Check items (locations)
condition(s)
<During cooling operation> • Check for failure in Pd
Pd sensor detects pressure pressure sensor.
equal to or greater than • Check service valves (gas
3.85 MPa. side, liquid side) to confirm
<During heating operation> full opening.
Pd sensor detects pressure • Check for failure in outdoor
equal to or greater than fan.
3.6 MPa. • Check for failure in outdoor
fan motor.
• Check outdoor PMV
(PMV1, 2, 3, 4) for
clogging.
• Check indoor/outdoor heat
exchangers for clogging.
• Check for short-circuiting
of outdoor suction/
discharge air flows.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in indoor
fan system (possible cause
of air flow reduction).
• Check opening status of
indoor PMV.
• Check indoor-outdoor
communication line for
wiring trouble.
• Check for troble operation
of check valve in discharge
pipe convergent section.
• Check gas balancing SV4
valve circuit.
• Check for refrigerant
overcharging.
Protected operation of Fan • Check fan motor.
inverter P.C. board • Check for failure in fan
P.C. board.
• Check connection of fan
motor connector.
• Check power voltage of
the main power supply.
IPM short-circuit is detected • Check connector
connection and wiring on
compressor P.C.board.
• Check for failure in
compressor P.C.board.
Open phase or IPM • Check for failure in
overcurrent for compressor compressor.
is detected. • Check connection of
connectors/terminals on
compressor and
compressor P.C.board.
• Check winding resistance
between phases of
compressor.
• Check for failure in
compressor P.C.board.
Position detection is not • Check wiring and
going on normally. connector connection.
• Check for compressor
layer short-circuit.
• Check for failure in
compressor P.C. board.
Trouble occurs in follower • Check check code of unit
unit under group control. that has generated alarm.
([P30] is displayed on central
control remote controller.)
There is duplication in • Check address settings.
central control addresses.
There is trouble in other • Check indoor P.C. board.
indoor unit in group,
resulting in detection of
E07/L07/L03/L08.
Central control device is • Check for failure in central
unable to receive signal. control device.
• Check for failure in central
control communication line.
• Check terminator resistor
setting.
• Check power supply for
devices at other end of
central control
communication line.
• Check failure in P.C.
boards of devices at other
end of central control
communication line.