40
Error Code Meaning of error code and detection method
Judgment and action
UL
(1300)
Abnormal low pressure (63L worked)
Abnormal if 63L is worked (under-
0.03MPa) during compressor operation.
63L: Low-pressure switch
(RP4-6VHA, RP4-6YHA)
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
Put 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 11-6.
Case
UF
(4100)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
1
Stop valve is closed.
2
Decrease of power supply
voltage
3
Looseness, disconnection or
converse of compressor wiring
connection
4
Defective compressor
5
Defective outdoor power board
1
Open stop valve.
2
Check facility of power supply.
3
Correct the wiring (U•V•W phase) to
compressor.
Refer to page 59 and 60.
4
Check compressor.
Refer to 11-6.
5
Replace outdoor power circuit board.
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 page 59 and 60.
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 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 page 59 and 60.
4
Check indoor/outdoor fan.
5
Solve short cycle.
6
Replace outdoor controller circuit board.
7
Check compressor.
Refer to 11-6.
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.
OC294-D-2.qxp 05.3.9 11:03 AM Page 40
