Check Codes Displayed On Remote Controller And Smms-I Outdoor Unit (7-Segment Display On I/F Board) And Locations To Be Checked - Carrier MMY-MAP0724FT9UL Service Manual

9-4. Check Codes Displayed on Remote Controller and SMMS-i 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
controller
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 Outdooroutdoor
communication
Location
of
Description
detection
Remote Indoor-remote
controller controller
communication
error
(detected at remote
controller end)
Remote Remote controller
controller transmission error
Indoor unit Indoor-remote
controller
communication
error
(detected at
indoor end)
Indoor Indoor-outdoor
unit communication
circuit error
(detected at
indoor end)
I/F Dropping out of
indoor unit
I/F Indoor-outdoor
communication
circuit error
(detected at
outdoor end)
Indoor unit Duplicated
I/F indoor address
Remote Duplicated master
controller remote controller
Indoor unit Indoor inter-MCU
communication
error
I/F Automatic
address starting
error
Error detection
System status
condition(s)
Stop of Communication between
corresponding indoor P.C. board and remote
unit controller is disrupted.
Stop of Signal cannot be transmitted
corresponding from remote controller to
unit indoor unit.
Stop of There is no communication
corresponding from remote controller
unit (including wireless) or network
adaptor.
Stop of Indoor unit is not receiving
corresponding signal from outdoor unit.
unit
All stop Indoor unit initially
communicating normally fails
to return signal for specified
length of time.
All stop Signal cannot be transmitted
from outdoor to indoor units
for 30 seconds continuously.
All stop More than one indoor unit is
assigned same address.
Stop of In two remote controller
corresponding configuration (including
unit wireless), both controllers are
set up as master. (Header
indoor unit is shut down with
alarm, while follower indoor
units continue operating.)
Stop of Communication cannot be
corresponding established/maintained upon
unit turning on of power or during
communication.
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.
– 139 –
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 defect 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 remote controller 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 termination
resistance 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 termination
resistance setting (SW30,
Bit 2).
• Check connection of
indoor-outdoor
communication circuit.
• Check indoor addresses.
• Check for any change made to
remote controller connection
(group/individual) since indoor
address setting.
• Check remote controller
settings.
• Check remote controller
P.C. boards.
• Check for defect in indoor
P.C. board
• Perform automatic address
setting again after
disconnecting
communication cable to that
refrigerant line.