28
Error Code
Abnormal point and detection method
Judgment and action
Eb
(6845)
Miswiring of indoor/outdoor unit
connecting wire (converse wiring or dis-
connection)
Outdoor controller circuit board can
automatically set the unit number of indoor
units.
Abnormal if the indoor unit number can-
not be set within 4 minutes after power on
because of miswiring (converse wiring or
disconnection) of indoor/outdoor unit con-
necting wire.
EC
(6846)
Start-up time over
The unit cannot finish start-up process
within 4 minutes after power on.
Case
1
Contact failure of indoor/
outdoor unit connecting wire
2
Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
7
2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8
Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
1
Contact failure or miswiring of
indoor/outdoor unit connecting
wire
2
Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
4
Defective transmitting receiving
circuit of outdoor controller circuit
board
5
Defective transmitting receiving
circuit of indoor controller board
6
Defective indoor power board
7
2 or more outdoor units have
refrigerant address “0”.
(In case of group control)
8
Noise has entered into power
supply or indoor/outdoor unit
connecting wire.
Indoor/outdoor unit connector
miswiring, excessive number of units
1. Outdoor controller circuit board can
automatically check the number of
connected indoor units. Abnormal if the
number cannot be checked automati-
cally due to miswiring of indoor/outdoor
unit connecting wire and etc. after power
is turned on for 4 minutes.
2. Abnormal if outdoor controller circuit
board recognizes excessive number of
indoor units.
1
Check disconnection or looseness or polar-
ity of indoor/outdoor unit connecting wire of
indoor and outdoor units.
2
Check diameter and length of indoor/outdoor
unit connecting wire.
Total wiring length: 80m
(Including wiring connecting each indoor unit
and between indoor and outdoor unit)
Also check if the connection order of flat
cable is S1, S2, S3.
3
Check the number of indoor units that are
connected to one outdoor unit. (If EA is
detected.)
4
~
6
Turn the power off once, and on again to
check.
Replace outdoor controller circuit board,
indoor controller board or indoor power
board if abnormality occurs again.
7
Check if refrigerant addresses (SW1-3 to
SW1-6 on outdoor controller circuit board)
are overlapping in case of group control
system.
8
Check transmission path, and remove the
cause.
w
The descriptions above,
1
-
8
, are for EA, Eb
and EC.
1
Contact failure or miswiring of
indoor/outdoor unit connecting
wire
2
Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
3
Excessive number of indoor
units are connected to 1 out-
door unit. (5 units or more)
4
Defective transmitting receiving
circuit of outdoor controller
circuit
board
5
Defective transmitting receiving
circuit of indoor controller board
6
Defective indoor power board
7
2 or more outdoor units have
refrigerant address “0” .
(In case of group control)
8
Noise has entered into power
supply or indoor / outdoor unit
connecting wire.
EA
(6844)
