Carrier MMY-MAP0724FT9UL Service Manual page 140

Check code
Main Outdoor 7-segment display
remote
Check Sub-code
controller
code
E15 E15 —
00:
Overloading
01-:
No. of units
connected
E16 E16
E18 — —
00:
No header unit
02:
Two or more
E19 E19
header units
01:
Connection of
outdoor unit
from other line
E20 E20
02:
Connection of
indoor unit from
other line
E23 E23 —
E25 E25 —
Address of
outdoor unit from
which signal is
not received
normally
E26 E26
Location
of
Description
detection
I/F Indoor unit not
found during
automatic
address setting
I/F Too many
indoor units
connected
Indoor unit Error in
communication
between indoor
header and
follower units
I/F Error in number
of outdoor
header units
I/F Connection to
other line found
during automatic
address setting
I/F Outdooroutdoor
communication
transmission error
I/F Duplicated
follower outdoor
address
I/F Dropping out of
outdoor unit
Error detection
System status
condition(s)
All stop Indoor unit cannot be
detected after indoor
automatic address setting is
started.
All stop • Combined capacity of indoor
units exceeds 125% of
combined capacity of
outdoor units.
Note:
If this code comes up after
backup setting for outdoor
unit failure is performed,
perform "No overloading
detected" setting.
<"No overloading detected"
setting method>
Turn on SW09/Bit 2 on I/F
P.C. board of outdoor header
unit.
• More than 40 indoor units are
connected.
Stop of Periodic communication
corresponding between indoor header and
unit follower units cannot be
maintained.
All stop • There is more than one
outdoor header unit in one
line.
• There is no outdoor header
unit in one line.
All stop Equipment from other line is
found to have been connected
when indoor automatic address
setting is in progress.
All stop Signal cannot be transmitted
to other outdoor units for at
least 30 seconds continuously.
All stop There is duplication in outdoor
addresses set manually.
All stop Outdoor unit initially
communicating normally fails
to return signal for specified
length of time.
– 140 –
Check items (locations)
• Check connection of
indoor-outdoor communication
line.
• Check for error in indoor
power supply system.
• Check for noise from other
devices.
• Check for power failure.
• Check for defect in indoor
P.C. board.
• Check capacities of indoor
units connected.
• Check combined HP
capacities of indoor units.
• Check HP capacity settings of
outdoor units.
• Check No. of indoor units
connected.
• Check for defect in outdoor
P.C. board (I/F).
• Check remote controller wiring.
• Check indoor power supply
wiring.
• Check P.C. boards of indoor
• units.
Outdoor header unit is
outdoor unit to which indoor-
outdoor tie cable (U1,U2) is
connected.
• Check connection of indoor-
outdoor
communication line.
• Check for defect in outdoor
P.C. board (I/F).
Disconnect inter-line tie cable
in accordance with automatic
address setting method
explained in "Address setting"
section.
• Check power supply to
outdoor units. (Is power
turned on?)
• Check connection of tie cables
between outdoor units for bad
contact or broken wire.
• Check communication
connectors on outdoor
P.C. boards.
• Check for defect in outdoor
P.C. board (I/F).
• Check termination resistance
setting for communication
between outdoor units.
Note:
Do not set outdoor
addresses manually.
• Backup setting is being used
for outdoor units.
• Check power supply to
outdoor unit. (Is power
turned on?)
• Check connection of tie cables
between outdoor units for bad
contact or broken wire.
• Check communication
connectors on outdoor
P.C. boards.
• Check for defect in outdoor
P.C. board (I/F).
• Check termination resistance
setting for communication
between outdoor units.