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Error Code
Abnormal point and detection method
Judgment and action
UL
(1300)
Low pressure (63L worked)
Abnormal if 63L is worked (under-
0.03MPa) during compressor operation.
63L: Low-pressure switch
(A42N only)
1 Stop valve of outdoor unit is
closed during operation.
2 Disconnection or loose connection
of connector (63L) on outdoor
controller board
3 Disconnection or loose
connection of 63L
4 Defective outdoor controller board
5 Leakage or shortage of refrigerant
6 Malfunction of linear expansion
valve
1 Check stop valve.
2~4 Turn the power off and on again to check
if F3 is displayed on restarting.
If F3 is displayed, follow the F3 processing
direction.
5 Correct to proper amount of refrigerant.
6 Check linear expansion valve.
Refer to 10-6.
Case
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent DC bus or com-
pressor is detected after compressor starts
operating for 30 seconds.
1 Stop valve of outdoor unit is
closed.
2 Decrease of power supply volt-
age
3 Looseness, disconnection or
converse of compressor wiring
connection
4 Defective fan of indoor/outdoor
units
5 Short cycle of indoor/outdoor
units
6 Defective input circuit of out-
door controller board
7 Defective compressor
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U·V·W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
4 Check indoor/outdoor fan.
5 Solve short cycle.
6 Replace outdoor controller circuit board.
7 Check compressor.
Refer to 10-6.
W Before the replacement of the outdoor
controller circuit board, disconnect the wiring
to compressor from the outdoor power circuit
board and check the output voltage among
phases, U, V, W, during test run. No defect
on board if voltage among phases (U-V, V-W
and W-U) is same. Make sure to perform the
voltage check with same performing frequency.
E0
or
E4
Remote controller transmission
error(E0)/signal receiving error(E4)
1 Abnormal if main or sub remote con-
troller cannot receive normally any trans-
mission from indoor unit of refrigerant
address “0” for 3 minutes.
(Error code : E0)
2 Abnormal if sub-remote controller could
not receive for any signal for 2 minutes.
(Error code: E0)
1 Abnormal if indoor controller board can
not receive any data normally from
remote controller board or from other
indoor controller board for 3 minutes.
(Error code: E4)
2 Indoor controller board cannot receive
any signal from remote controller for 2
minutes. (Error code: E4)
1 Check disconnection or looseness of indoor
unit or transmission wire of remote controller.
2 Set one of the remote controllers “main”.
If there is no problem with the action above.
3 Check wiring of remote controller.
• Total wiring length: max. 500m[1640ft]
(Do not use cable o 3 or more.)
• The number of connecting indoor units:
max. 16 units
• The number of connecting remote con-
troller: max. 2 units
When the above-mentioned problem of 1~3
are not applied
4 Diagnose remote controllers.
a) When “RC OK” is displayed,
remote controllers have no problem.
Turn the power off, and on again to
check. If abnormality generates again,
replace indoor controller board.
b) When “RC NG” is displayed,
replace remote controller.
c) When “RC E3” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)→Noise may be causing abnormality. ]
∗ If the unit is not normal after replacing
indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.
1 Contact failure at transmission
wire of remote controller
2 All remote controllers are set
as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.
3 Miswiring of remote controller
4 Defective transmitting receiving
circuit of remote controller
5 Defective transmitting receiving
circuit of indoor controller board
of refrigerant address “0”.
6 Noise has entered into the
transmission wire of remote
controller.
E1
or
E2
Remote controller control board
1 Abnormal if data cannot be normally
read from the nonvolatile memory of the
remote controller control board.
(Error code: E1)
2 Abnormal if the clock function of remote
controller cannot be normally operated.
(Error code: E2)
1 Defective remote controller 1 Replace remote controller.
OCH429--2.qxp 07.11.20 9:18 AM Page 40