41
Error Code Meaning of error code and detection method
Judgment and action
UL
(1300)
Abnormal low pressure
Abnormal if the following conditions are
detected for continuously 3 minutes after
compressor starts heating operating for 10
minutes.
1. Heating mode
Detection mode1
TH7-TH3
[
4
:
and
TH5-Indoor room temperature
[
2
:
Detection mode2
TH7-TH3
[
2
:
and
TH5-Indoor room temperature
[
4
:
and
TH2-Indoor room temperature
[
4
:
2.Cooling mode
TH6-TH7
[
2
:
and
TH3-TH7
[
2
:
and
Indoor room temperature - Indoor liquid
pipe temperature (TH2)
[
5
:
Thermistor TH3:Outdoor liquid pipe temperature
TH5:Indoor cond./eva. temperature
TH7:Outdoor temperature
1
Stop valve of outdoor unit is
closed during operation.
2
Leakage or shortage of refrigerant
3
Malfunction of linear expansion
valve.
4
Clogging with foreign objects in
refrigerant circuit.
w
Clogging occures in the parts
which become below freezing
point when water enter in
refrigerant circuit.
1
Check stop valve.
2
Check intake super heat.
Check leakage of refrigerant.
Check additional refrigerant.
3
Check linear expansion valve.
Refer to 10-6.
4
After collecting refrigerant, remove water
from entire refrigerant circuit under vacuum
more than 1 hour.
Case
UH
(5300)
Current sensor error
Abnormal if current sensor detects –1.5A to
1.5A during compressor operation. (This
error is ignored in case of test run mode.)
1
Disconnection of compressor
wiring
2
Defective circuit of current
sensor on outdoor power
circuit board
1
Correct the wiring (U
•
V
•
W phase) to
compressor. Refer to 10-9 (Outdoor power
circuit board).
2
Replace outdoor power circuit board.
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent DC 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 voltage
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 can not receive normally any
transmission from indoor unit of refriger-
ant address “0” for three minutes.
(Error code : E0)
2
Abnormal if sub remote controller could
not receive for any signal for two min-
utes. (Error code: E0)
1
Abnormal if indoor controller board can
not receive normally any data from
remote controller board or from other
indoor controller board for three minutes.
(Error code: E4)
2
Indoor controller board cannot receive
any signal from remote controller for two
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
(Do not use cable
o
3 or more)
• The number of connecting indoor units:
max.16units
• The number of connecting remote con-
troller: max.2units
When it is not the above-mentioned problem of
1
~
3
4
Diagnose remote controllers.
a) When “RC OK” is displayed,
Remote controllers have no problem.
Put 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
Mis-wiring 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.
OC374A--2.qxp 06.7.26 5:54 PM Page 41
