Toshiba MMD-UP0721HFP-UL Service Manual page 68

Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
No. of indoor
units from
which signal is
received
normally
E04/E06 E06
— E07 —
Duplicated
indoor address
E08 E08
E09 — —
E10 — —
01:
Indoor-outdoor
communication
02:
Outdoor-outdoor
E12 E12
communication
E15 E15 —
Location
Description System status
of
detection
Indoor unit Indoor-outdoor All stop
communication
circuit trouble
(E04)
I/F Dropping out of
indoor unit
(E06)
I/F Indoor-outdoor All stop
communication
circuit trouble
(detected at
outdoor end)
Indoor unit Duplicated All stop
I/F indoor address
Remote Duplicated Stop of
controller master remote corresponding
controller unit
Indoor unit Indoor inter- Stop of
MCU corresponding
communication unit
trouble
I/F Automatic All stop
address starting
trouble
I/F Indoor unit not All stop
found during
automatic
address setting
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Check code detection
Check items (locations)
condition(s)
Condition 1 • Check power supply to
One indoor unit or more indoor unit.
(Is power turned on?)
initially communicating
normally fails to return signal • Check indoor-outdoor
for specified length of time. power-on sequence.
• Check indoor address
setting
Condition 2
Outdoor I / F board • Check wiring of Indoor-
SW103, Bit4 : ON outdoor communication
(To switch the check code wires
detection condition.) • Check outdoor terminator
resistor setting (SW100,
SW103
Bit 2).
ON
• Check power supply to
indoor unit.
1 2 3 4
(Is power turned on?)
• Check connection of
indoor-outdoor
communication cable.
Display on main remote
• Check connection of
controller.
communication connectors
Indoor units unavailable for
on indoor P.C. board.
indoor / outdoor
• Check connection of
communication. :E04
communication connectors
Indoor units available for
on outdoor P.C. board.
indoor / outdoor
• Check for failure in indoor
communication. : E06
P.C. board.
• Check for failure in outdoor
P.C. board (I/F).
Signal cannot be transmitted • Check outdoor terminator
from outdoor to indoor units resistor setting (SW100,
for 30 seconds continuously. Bit 2).
• Check connection of
indoor-outdoor
communication circuit.
More than one indoor unit • Check indoor addresses.
are assigned same address. • Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.
In two remote controller • Check remote controller
configuration (including settings.
wireless), both controllers • Check remote controller
are set up as master. P.C. boards.
(Header indoor unit is shut
down with alarm, while
follower indoor units
continue operating.)
Communication cannot be • Check for failure in
established/maintained upon indoor P.C. board
turning on of power or
during communication.
• Perform automatic address
• Indoor automatic address
setting is started while setting again after
automatic address setting disconnecting
for equipment in other communication cable to
refrigerant line is in that refrigerant line.
progress.
• Outdoor automatic
address setting is started
while automatic address
setting for indoor units is in
progress.
Indoor unit cannot be • Check connection of
detected after indoor indoor-outdoor
automatic address setting is communication line.
started. • Check for trouble in indoor
power supply system.
• Check for noise from other
devices.
• Check for power failure.
• Check for failure in indoor
P.C. board.