Mitsubishi Electric PUHZ-FRP71VHA2R1, Руководство по обслуживанию

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31
OCH665B
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
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 "10-9. TEST POINT DIAGRAM".
(Outdoor power circuit board).
4
Check compressor. Refer to "10-6. HOW TO
CHECK THE PARTS".
5
Replace outdoor power circuit board.
6
Check the dip switch setting of outdoor controller
circuit board.
Refer to "Model Select" in "1) Function of
switches" in "10-10. FUNCTION OF SWITCHES,
CONNECTORS AND JUMPERS".
Ud
(1504)
Over heat protection
Abnormal if outdoor pipe thermistor (TH3)
detects 70°C 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)
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.
Check Code
Abnormal point and detection method
Cause
Judgment and action
UE
(1509)
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 "10-10. FUNCTION
OF SWITCHES, CONNECTORS AND
JUMPERS".)
3
Replace outdoor controller board.
Current sensor error or input current error
Abnormal if 38A of input current is detected
or 34A or more of input current is detected
for 10 seconds continuously.
1
Defective circuit of current
sensor on outdoor power circuit
board
2 Decrease of power supply
voltage
1
Replace outdoor power circuit board.
2 Check the facility of power supply.
UH
(5300)
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent 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
reverse 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
8 Defective outdoor power circuit
board
9
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 compres-
sor. Refer to "10-9. TEST POINT DIAGRAM".
(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. HOW TO
CHECK THE PARTS".
Note: 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.
8 Replace outdoor power circuit board
9
Check the dip switch setting of outdoor con-
troller circuit board