Toshiba Carrier MMU-AP0074HPUL, Service Manual

Page: 62 / 105

8-4. Check codes displayed on remote controller and SMMS outdoor unit (7-segment
display on I/F board) and locations to be checked
Check code
Location
of
detection
Description System status
Error detection
condition(s)
Check items (locations)
Outdoor 7-segment display
Sub-code
E01
Remote
controller Indoor-remote
controller
communication
error
(detected at
remote
controller end) Stop of
corresponding
unit Communication between
indoor P.C. board and remote
controller is disrupted. Check remote controller
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 controller
address settings
(when two remote
controllers are in use).
Check remote controller
P.C. board.
E02
Remote
controller Remote
controller
transmission
error Stop of
corresponding
unit Signal cannot be transmitted
from remote controller to
indoor unit. Check internal
transmission circuit of
remote controller.
--- Replace remote
controller as necessary.
E03
Indoor
unit Indoor-remote
controller
communication
error
(detected at
indoor end) Stop of
corresponding
unit There is no communication
from remote controller
(including wireless) or
network adaptor. Check remote controller
and network adaptor
wiring.
E04
Indoor
unit Indoor-outdoor
communication
circuit error
(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 termination
resistance setting (SW30,
Bit 2).
E06 E06
E07
No. of indoor
units from
which signal is
received
normally I/F Dropping out 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).
I/F Indoor-outdoor
communication
circuit error
(detected at
outdoor end) All stop Signal cannot be transmitted
from outdoor to indoor units
for 30 seconds continuously. Check outdoor termination
resistance setting (SW30,
Bit 2).
Check connection of
indoor-outdoor
communication circuit.
Check
code
Main
remote
controller
For other types of outdoor units, refer to their own service manuals.
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