Service manual

29
Error Code
Meaning of error code and detection method Judgment and action
Eb
(6845)
Mis-wiring of indoor/outdoor unit con-
necting wire (converse wiring or dis-
connection)
Outdoor controller board can automatically
set the unit number of indoor units.
Abnormal if the indoor unit number can not
be set within four minutes after power on
because of mis-wiring (converse wiring or
disconnection) of indoor/outdoor unit con-
necting wire.
EC
(6846)
Start-up time over
The unit can not finish start-up process
within four minutes after power on.
Case
1 Contact failure of indoor/out-
door unit connecting wire
2 Diameter or length of indoor/
outdoor unit connecting wire is
out of specified capacity.
7 Two 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 mis-wiring 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 board
5 Defective transmitting receiving
circuit of indoor controller board
6 Defective indoor power board
7 Two 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 mis-
wiring, excessive number of units (4
units or more)
1. Outdoor controller board can automati-
cally check the number of connected
indoor units. Abnormal if the number
cannot be checked automatically due to
mis-wiring of indoor/outdoor unit con-
necting wire and etc. after power is
turned on for 4 minutes.
2. Abnormal if outdoor controller board rec-
ognizes the number of connected indoor
units as “4 units or more”.
1 Check disconnection or looseness or polarity
of indoor/outdoor unit connecting wire of
indoor and outdoor units.
2 Check diameter and length of indoor/outdoor
unit connecting wire.
Outdoor-indoor units’ interval: 50m maximum
Indoor-indoor units’ interval: 30m maximum
Also check if the connection order of flat
cable (VVF etc.) is S1, S2, S3.
3 Check the number of indoor units that are
connected to one outdoor unit. (If EA is
detected)
4~6 Put the power off once, and on again to
check.
Replace outdoor controller 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 board) are over-
lapping in case of group control system.
8 Check transmission path, and remove the
cause.
1 Contact failure or mis-wiring of
indoor/outdoor unit connecting
wire
2 Diameter or length of
indoor/outdoor unit connecting
wire is out of specified capacity.
3 4 or more indoor units are con-
nected to one outdoor unit.
4 Defective transmitting receiving
circuit of outdoor controller
board
5 Defective transmitting receiving
circuit of indoor controller
board
6 Defective indoor power board
7 Two 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)
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