Toshiba MML-AP0124H2UL Service Manual page 64

Check code
Main
Outdoor 7-segment display
remote
Check
Sub-code
control
code
L09 — —
L10 L10 —
L20 — —
L23 — —
L28 L28 —
A3-IPDU Fan-IPDU
1 2 1
01 O
02 O
03 O O
08 O
09 O O
0A O O
0B O O O
L29 L29
10
11 O
12 O
13 O O
18 O
19 O O
1A O O
1B O O O
Circle (O): IPDU trouble
Detected indoor
address
L30 L30
— L31 —
P01 — —
P03 P03 —
Location
of
Description
detection
Indoor Indoor capacity
unit not set
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 IPDUs
2
O
O
O
O
O
O
O
O
Indoor External
unit interlock of
indoor unit
I/F Extended IC
trouble
Indoor Indoor fan
unit motor trouble
I/F Discharge
temperature
TD1 trouble
Trouble detection
System status
condition(s)
Stop of Capacity setting has not been
corresponding performed for indoor unit.
unit
All stop Jumper wire provided on P.C.
board for servicing I/F P.C. board
has not been removed as required
for given model.
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 three outdoor
units.
All stop Insufficient number of IPDUs are
detected when power is turned on.
Stop of • Signal is present at external
corresponding trouble input terminal (CN80)
unit for 1 minute.
Continued There is part failure in P.C. board
operation (I/F).
Stop of
corresponding
unit
All stop Discharge temperature (TD1)
exceeds 239°F (115°C).
– 64 –
Check items (locations)
Set indoor capacity. (DN = 11)
Check model setting of P.C. board
for servicing outdoor I/F P.C. board.
• Check central control addresses.
• Check network adaptor P.C.
board .
• Check switch setting of Bit 3 and
4 of SW17 in outdoor P.C. board
(I/F).
• Check No. of outdoor units
connected (Only up to 3 units per
system allowed).
• Check communication lines
between outdoor units.
• Check for defect 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 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).