Mitsubishi Electric PUD-SHWM100VAA, Руководство по обслуживанию

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27
OCH756
From the previous page.
Check code Abnormal point and detection method Cause Judgment and action
U9
(4220)
Detailed
codes
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at 310 V or
lower for consecutive 10 seconds
(V-type only)
1
Incorrect switch settings on the
outdoor controller circuit board for
model select
2
Defective outdoor power circuit
board
3
Defective outdoor controller circuit
board
1
Correction of a model select
2
Replace outdoor power circuit board.
3
Replace outdoor controller circuit board.
20
Ud
(1504)
Overheat protection
Abnormal if TH3, condensing temperature
T63HS detects 70°C or more during com-
pressor operation.
TH3: Thermistor <Liquid>
1
Defective outdoor fan (fan motor) or
short cycle of outdoor unit during
cooling operation
2
Defective TH3, condensing
temperature T
63HS
3
Defective outdoor controller board
1
Check outdoor unit air passage.
23
Turn the power off and on again to
check the check code. If U4 is dis-
played, follow the U4 processing direc-
tion.
UE
(1302)
Abnormal pressure of 63HS
Abnormal if 63HS detects 0.1 MPa or
less.
Detection is inoperative for 3 minutes
after compressor starting and 3 minutes
after and during defrosting.
63HS: High pressure sensor
1
Disconnection or contact failure of
connector (63HS) on the outdoor
controller circuit board
2
Defective pressure sensor
3
Defective outdoor controller circuit
board
1
Check connection of connector (63HS) on
the outdoor controller circuit board.
Check breaking of the lead wire for 63HS.
2
Check pressure by microprocessor.
(Pressure sensor/ 63HS)
(SW2: Refer to "9-7. FUNCTION OF
SWITCHES, CONNECTORS AND
JUMPERS".)
3
Replace outdoor controller board.
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 con-
verse of compressor wiring connec-
tion
4
Defective compressor
5
Defective outdoor power board
6
DIP switch setting difference of out-
door controller circuit board
1
Open stop valve.
2
Check facility of power supply.
3
Correct the wiring (U•V•W phase) to
compressor.
Refer to "9-6.TEST POINT DIAGRAM".
(Outdoor power circuit board).
4
Check compressor.
Refer to "9-4. HOW TO CHECK THE
PARTS".
5
Replace outdoor power circuit board.
6
Check the DIP switch setting of outdoor
controller circuit board.
UH
(5300)
Current sensor error or input current
error
• Abnormal if current sensor detects –1.0A
to 1.0A during compressor operation.
(This error is ignored in the case of test
run mode.)
• Abnormal if the detected input current or
the detected continuous current for 10
second is more than the limit value.
<Instant limit value>
60-120 V: 38 A 140 V: 40 A
<Continuous limit value>
60-120 V: 34 A 140 V: 37 A
1
Disconnection of compressor wiring
2
Defective circuit of current sensor on
outdoor power circuit board
3
Decrease of power supply voltage
4
Leakage or shortage of refrigerant
1
Correct the wiring (U
•
V
•
W phase) to
compressor. Refer to "9-6.TEST POINT
DIAGRAM" (Outdoor power circuit board).
2
Replace outdoor power circuit board.
3
Check the facility of power supply.
4
Check leakage of refrigerant.
UL
(1300)
Low Pressure (Low pressure switch 63L
operated)
Disconnection or contact failure of 63L
connection
63L: Low pressure switch
1
Disconnection or contact failure of
connector (63L) on outdoor controller
board
1
Check short wiring connected to connector
(63L).