– 59 –
Main
remote
control
Check code
E16
E16
00:
Overloading
01-:
No. of units connected
I/F
Too many
indoor units
connected
All stop
• Combined capacity of indoor units
exceeds 135% 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 64 indoor units are
connected.
• 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).
E18
—
—
Indoor
unit
Trouble in
communication
between indoor
header and
follower units
Stop of
corresponding
unit
Periodic communication between
indoor header and follower units
cannot be maintained.
• Check remote control wiring.
• Check indoor power supply wiring.
• Check P.C. boards of indoor units.
E19
E19
00:
No header unit
02:
Two or more header
units
I/F
Trouble in
number of
outdoor header
units
All stop
• There are more than one outdoor
header units in one line.
• There is no outdoor header unit in
one line.
Outdoor header unit is
outdoor unit to which indooroutdoor
tie cable (U1,U2) is
connected.
• Check connection of indoor-
outdoor communication line.
• Check for defect in outdoor P.C.
board (I/F).
E20
E20
01:
Connection of outdoor
unit from other line
02:
Connection of indoor
unit from other line
I/F
Connection to
other line found
during
automatic
address setting
All stop
Equipment from other line is found
to have been connected when
indoor automatic address setting is
in progress.
Disconnect inter-line tie cable in
accordance with automatic address
setting method explained in
“Address setting” section.
E26
E26
Address of outdoor unit
from which signal is not
received normally
I/F
Signal lack of
outdoor unit
All stop
Outdoor unit initially
communicating normally fails
to return signal for specified
length of time.
• 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).
E28
E28
Detected outdoor unit
No.
I/F
Outdoor
follower unit
trouble
All stop
Outdoor header unit receives
trouble code from outdoor follower
unit.
• Check check code displayed on
outdoor follower unit.
<Convenient functions>
If SW04 is pressed and held for at
least 1 second while [E28] is
displayed on the 7-segment display
of outdoor header unit, the fan of
the outdoor unit that has been shut
down due to an trouble comes on.
If SW04 and SW05 are pressed
simultaneously, the fans of normal
outdoor units come on.
To stop the fan or fans, press
SW05 on its own.
E23
E23
—
I/F
Outdooroutdoor
communication
transmission
trouble
All stop
Signal cannot be transmitted to
other outdoor units for at least 30
seconds continuously.
• 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.
E25
E25
—
I/F
Duplicated
follower outdoor
address
All stop
There is duplication in outdoor
addresses set manually.
Note:
Do not set outdoor addresses
manually.
Outdoor 7-segment display
Check
code
Sub-code
Location
of
detection
Description
System status
Trouble detection
condition(s)
Check items (locations)
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