Mitsubishi Electric Mr.Slim PUHZ-SHW230YKA2, Руководство по обслуживанию

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22
OCH594B
UF
Compressor overcurrent interruption
(When compressor is 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
reverse of compressor wiring
connection
4
Defective compressor
5
Defective outdoor power board
6
DIP switch setting difference of
outdoor 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 "8-7. TEST POINT DIAGRAM"
(Outdoor power circuit board).
4
Check compressor.
Refer to "8-5. HOW TO CHECK THE PARTS".
5
Replace outdoor power circuit board.
6
Check the DIP switch setting of outdoor con-
troller circuit board. Refer to "Model Select" in
"1) Function of switches" in "8-8. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".
Ud
Overheat protection
Abnormal if outdoor pipe thermistor (TH3),
condensing temperature T
63HS
detects 70
:
or more during compressor operation.
1
Defective outdoor fan (fan
motor) or short cycle of outdoor
unit during cooling operation
2
Defective outdoor pipe
thermistor (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 displayed, follow
the U4 processing direction.
UE
Abnormal pressure of pressure sensor
(63HS)
Abnormal if pressure sensor (63HS)
detects 0.1 MPa or less.
Detection is inoperative for 3 minutes after
compressor starting and 3 minutes after
and during defrosting.
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
thermistor (63HS).
2
Check pressure by microprocessor.
(Pressure sensor/ 63HS)
(SW2: Refer to "8-8. FUNCTION OF
SWITCHES, CONNECTORS AND
JUMPERS".)
3
Replace outdoor controller board.
UH
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 case of test run mode.)
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 "8-7. 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.
Abnormal point and detection method Judgment and action
Case
UL
Low pressure (63L operated)
Abnormal if 63L is operated (under −0.03
MPa) during compressor operation.
63L: Low pressure switch
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 "8-6. HOW TO CHECK THE
COMPONENTS".
Check Code