Toshiba MMU-AP0072H2UL-1 Service Manual page 88

8-4. Check Codes Displayed on Remote Control and SMMS-e Outdoor Unit
(7-Segment Display on I/F Board) and Locations to Be Checked
For other types of outdoor units, refer to their own service manuals.
Check code
Main
Outdoor 7-segment display
remote
Check
Sub-code
control
code
E01 — —
E02 — —
E03 — —
E04 — —
No. of indoor units from
which signal is received
normally
E06 E06
— E07 —
Duplicated indoor
address
E08 E08
E09 — —
E10 — —
01:
Indoor-outdoor
communication
02:
E12 E12
Outdoor-outdoor
communication
E15 E15 —
Location
of
Description System status
detection
Remote Indoor-remote Stop of
control control corresponding
communication unit
trouble
(detected at
remote
control end)
Remote Remote control Stop of
control transmission corresponding
trouble unit
Indoor Indoor-remote Stop of
unit control corresponding
communication unit
trouble
(detected at
indoor end)
Indoor Indoor-outdoor Stop of
unit communication corresponding
circuit trouble unit
(detected at
indoor end)
I/F Signal lack of All stop
indoor unit
I/F Indoor-outdoor All stop
communication
circuit trouble
(detected at
outdoor end)
Indoor Duplicated All stop
unit I/F indoor address
Remote Duplicated Stop of
control master remote corresponding
control unit
Indoor Indoor inter- Stop of
unit 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
Trouble detection
condition(s)
Communication between indoor
P.C. board and remote control is
disrupted.
Signal cannot be transmitted from
remote control to indoor unit.
There is no communication from
remote control (including wireless)
or network adaptor.
Indoor unit is not receiving signal
from outdoor unit.
Indoor unit initially
communicating normally fails
to return signal for specified
length of time.
Signal cannot be transmitted from
outdoor to indoor units for 30
seconds continuously.
More than one indoor unit are
assigned same address.
In two remote control configuration
(including wireless), both controls
are set up as master. (Header
indoor unit is shut down with alarm,
while follower indoor units continue
operating.)
Communication cannot be
established/maintained upon
turning on of power or during
communication.
• Indoor automatic address setting
is started while automatic address
setting for equipment in other
refrigerant line is in progress.
• Outdoor automatic address
setting is started while automatic
address setting for indoor units is
in progress.
Indoor unit cannot be
detected after indoor
automatic address setting is
started.
88
Check items (locations)
• Check remote control inter-unit
tie cable (A/B).
• Check for broken wire or
connector bad contact.
• Check indoor power supply.
• Check for defect in indoor P.C.
board.
• Check remote control address
settings (when two remote
controls are in use).
• Check remote control P.C. board.
• Check internal transmission
circuit of remote control.
--- Replace remote control as
necessary.
• Check remote control and
network adaptor wiring.
• Check order in which power was
turned on for indoor and outdoor
units.
• Check indoor address setting.
• Check indoor-outdoor tie cable.
• Check outdoor terminator resistor
setting (SW30, Bit 2).
• Check power supply to indoor unit.
(Is power turned on?)
• Check connection of indoor-
outdoor communication cable.
• Check connection of
communication connectors on
indoor P.C. board.
• Check connection of
communication connectors on
outdoor P.C. board.
• Check for defect in indoor P.C.
board.
• Check for defect in outdoor P.C.
board (I/F).
• Check outdoor terminator resistor
setting (SW30, Bit 2).
• Check connection of indoor-
outdoor communication circuit.
• Check indoor addresses.
• Check for any change made to
remote control connection
(group/individual) since indoor
address setting.
• Check remote control settings.
• Check remote control P.C.
boards.
• Check for defect in indoor P.C.
board
• Perform automatic address
setting again after disconnecting
communication cable to that
refrigerant line.
• Check connection of indoor-
outdoor communication line.
• Check for trouble in indoor power
supply system.
• Check for noise from other devices.
• Check for power failure.
• Check for defect in indoor P.C.
board.