Toshiba MML-AP0074BH2UL Service Manual Download

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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.

Main

remote
control

Check code

E01

—

Remote
control

Indoor-remote
control
communication
trouble
(detected at
remote
control end)

Stop of
corresponding
unit

Communication between indoor
P.C. board and remote control is
disrupted.

• 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.

E02

—

Remote
control

Remote control
transmission
trouble

Stop of
corresponding
unit

Signal cannot be transmitted from
remote control to indoor unit.

• Check internal transmission
circuit of remote control.
--- Replace remote control as
necessary.

E03

—

Indoor
unit

Indoor-remote
control
communication
trouble
(detected at
indoor end)

Stop of
corresponding
unit

There is no communication from
remote control (including wireless)
or network adaptor.

• Check remote control and
network adaptor wiring.

E04

—

Indoor
unit

Indoor-outdoor
communication
circuit trouble
(detected at
indoor end)

Stop of
corresponding
unit

Indoor unit is not receiving signal
from outdoor unit.

• Check order in which power was
turned on for indoor and outdoor
units.
• Check indoor address setting.
• Check indoor-outdoor tie cable.
• Check outdoor terminating
resistor setting (SW30, Bit 2).

E09

—

Remote
control

Duplicated
master remote
control

Stop of
corresponding
unit

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.)

• Check remote control settings.
• Check remote control P.C.
boards.

E10

—

Indoor
unit

Indoor inter-
MCU
communication
trouble

Stop of
corresponding
unit

Communication cannot be
established/maintained upon
turning on of power or during
communication.

• Check for defect in indoor P.C.
board

E12

01:
Indoor-outdoor
communication
02:
Outdoor-outdoor
communication

I/F

Automatic
address starting
trouble

All stop

• 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.

• Perform automatic address
setting again after disconnecting
communication cable to that
refrigerant line.

E15

—

I/F

Indoor unit not
found during
automatic
address setting

All stop

Indoor unit cannot be
detected after indoor
automatic address setting is
started.

• 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.

E06

No. of indoor units from
which signal is received
normally

I/F

Signal lack of
indoor unit

All stop

Indoor unit initially
communicating normally fails
to return signal for specified
length of time.

• 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).

E08

Duplicated indoor
address

Indoor
unit I/F

Duplicated
indoor address

All stop

More than one indoor unit are
assigned same address.

• Check indoor addresses.
• Check for any change made to
remote control connection
(group/individual) since indoor
address setting.

—

E07

—

I/F

Indoor-outdoor
communication
circuit trouble
(detected at
outdoor end)