Check Codes - Toshiba MMU-UP0071MH-UL Service Manual

9-4. Check Codes

(Displayed on remote controller and 7-segment display of outdoor Unit)
The contents of these check code tables differ depending on the outdoor unit to be connected. Refer to the
service manual of the connected outdoor unit. (The table below is for the SMMS-u series.)
Check code
Main Outdoor 7-segment display
remote
Check
Sub-code
controller
code
E01 — —
E02 — —
—
E04 — —
No. of indoor
units from
which signal is
received
normally
E06
E04
— —
Location
Description
of
detection
Remote Indoor-remote
controller controller
communication
trouble
(detected at
remote
controller end)
Remote Remote
controller controller
transmission
trouble
Indoor unit Indoor-outdoor
communication
circuit trouble
(detected at
indoor end)
I/F Dropping out of
indoor unit
Indoor unit Indoor-outdoor
communication
circuit trouble
Check code detection
System status
condition(s)
Stop of Communication between
corresponding indoor P.C. board and
unit remote controller is
disrupted.
Stop of Signal cannot be transmitted
corresponding from remote controller to
unit indoor unit.
Stop of Indoor unit is not receiving
corresponding signal from outdoor unit.
unit
All stop Condition 1
All indoor unit initially
communicating normally
fails to return signal for
specified length of time.
Condition 2
Outdoor I / F board
SW103, Bit4 : OFF
(Factory default)
Only specified Condition 1
indoor units stop Indoor unit initially
communicating
normally fails to return
signal for specified
length of time.
– 99 –
Check items (locations)
• Check remote controller
inter-unit tie cable (A/B).
• Check for broken wire or
connector bad contact.
• Check indoor power
supply.
• Check for failure in indoor
P.C. board.
• Check remote controller
address settings
(when two remote
controllers are in use).
• Check remote controller
P.C. board.
• Check internal
transmission circuit of
remote controller.
--- Replace remote
controller as necessary.
• 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 (SW100,
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 failure in indoor
P.C. board.
• Check for failure in outdoor
P.C. board (I/F).
• Check power supply to
indoor unit.
(Is power turned on?)
• Check indoor-outdoor
power-on sequence.
• Check indoor address
setting
• Check wiring of Indoor-
outdoor communication
wires
• Check outdoor terminator
resistor setting (SW100,
Bit 2).