Toshiba MMD-AP0721HP-UL1 Service Manual page 68

Check code
Outdoor 7-segment display
Main
remote
Check
Sub-code
control
code
A3-IPDU Fan-IPDU
1 2 1 2
01 ○
02 ○
03 ○ ○
08 ○
09 ○ ○
0A ○ ○
0B ○ ○ ○
L29 L29
Detected indoor address
L30 L30
– L31 –
P01 – –
P03 P03 –
Location
of
detection
Trouble in No.
I/F
A3-IPDU Fan-IPDU
of IPDUs
1 2 1 2
10 ○
11 ○ ○
12 ○ ○
13 ○ ○ ○
18 ○ ○
19 ○ ○ ○
1A ○ ○ ○
1B ○ ○ ○ ○
Circle (O): IPDU trouble
Indoor External
unit interlock of
indoor unit
I/F Extended IC
trouble
Indoor Indoor fan
trouble
unit
I/F Discharge
temperature
TD1 trouble
Description System status
All stop Insufficient number of IPDUs
are detected when power is
turned on.
Stop of • Signal is present at
external trouble input
corresponding
unit
terminal (CN80) for 1
minute.
Continued There is part failure in P.C.
operation board (I/F).
Stop of
corresponding
unit
All stop Discharge temperature
(TD1) exceeds
239°F(115°C)
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Trouble detection
Check items (locations)
condition(s)
• Check model setting of
P.C. board for servicing
outdoor I/F P.C. board.
• Check connection of UART
communication connector.
• Check A3-IPDU, fan IPDU,
and I/F P.C. board for
defect.
When external device is
connected to CN80
connector:
1) Check for defect in
external device.
2) Check for defect in indoor
P.C. board.
When external device is not
connected to CN80
connector:
1) Check for defect 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, 3) for clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for defect in 4-way
valve.
• Check for leakage of
SV4 circuit.
• Check SV4 circuit (wiring
or installation trouble
in SV41 or SV42).