39
Error Code
Meaning of error code and detection method
Judgment and action
U1
(1302)
Abnormal high pressure (High-pressure
switch 63H worked)
Abnormal if high-pressure switch 63H
worked (more than 3.24 MPa) during com-
pressor operation.
63H: High-pressure switch
✽
Use current sensor to detect work or
return of 63H.
1
Short cycle of indoor unit
2
Clogged filter of indoor unit
3
Decreased airflow caused by
dirt of indoor fan
4
Dirt of indoor heat exchanger
5
Locked indoor fan motor
6
Malfunction of indoor fan
motor
7
Defective operation of stop
valve (Not full open)
8
Clogged or broken pipe
9
Locked outdoor fan motor
0
Malfunction of outdoor fan
motor
1
Short cycle of outdoor unit
2
Dirt of outdoor heat exchanger
3
Disconnection or contact failure
of 63H connection
4
Defective outdoor controller
board
5
Defective action of liner expan-
sion valve
6
Refrigerant overcharge
1
-
6
Check indoor unit and repair defectives.
7
Check full open stop valve.
8
Check piping and repair defectives.
9
-
2
Check indoor unit and repair defectives.
3
,
4
Put the power off and check UH display
when the power is put again.
Follow the UH display if UH is displayed.
5
Check linear expansion valve.
Refer to 10-6.
6
Replace refrigerant.
U1
Abnormal low current or open phase
• An extreme degradation of current value
causes abnormal stop.
• Abnormal if current detected phase (V-
phase) is open phase after first compres-
sor start-up after supplying the power by
three phase power supply model.
• When compressor is operating, compres-
sor is suspended under the following
condition: and when current detector
(CT) detects a current, which is lower
than the detected current specified in the
table below, under the following condi-
tion:
<Condition>
1
For PUH-P25V and PU/PUH-P35 ~
P100V
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
0.7-0.8 second.
2
For PU/PUH-P35 ~ P140Y
Current detector (CT) has detected a
current, which is lower than the detected
current specified in the table below, for
0.4-0.5 second.
1
Shortage of refrigerant
2
Abnormal pressure degrada-
tion by pomp down operation
3
V-phased open phase of com-
pressor
4
Abnormal compressor
Not abnormal if V is instantly
displayed when the main
power is put off.
1
Check if refrigerant pressure is not degraded.
2
Check current of compressor operation when
abnormality occurred.
3
Check wiring of compressor.
4
Check or replace compressor.
Case
Model
P25V
P35V
P35Y
P50V
P50Y
P60V
P60Y
Detected current
1.0
1.3
1.0
1.6
1.0
1.8
1.0
Model
P71V
P71Y
P100V
P100Y
P125Y
P140Y
Detected current
2.4
1.0
1.0
1.0
1.5
1.7
[A]
U2
(1102)
Abnormal high discharging temperature
Abnormal if discharging temperature ther-
mistor (TH4) exceeds following tempera-
ture during compressor operation.
Normal operation: 115
:
(P25-P100)/
125
:
(P125,P140)
or more for three min-
utes continuously or
135
:
During defrosting: 135
:
1
Over-heated compressor oper-
ation caused by shortage of
refrigerant
2
Defective operation of stop
valve
3
Defective thermistor
4
Defective outdoor controller
board
5
Defective action of linear
expansion valve
1
Check intake super heat.
Check leakage of refrigerant.
Charge refrigerant.
2
Check if stop valve is full open.
34
Put the power off and check if U3 is
displayed when the power is put again.
When U3 is displayed, refer to “Judgement
and action” for U3.
5
Check linear expansion valve.
Refer to 10-6.
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