Mitsubishi Electric PUHZ-W85VAA Service Manual page 19

From the previous page.
Check code
Abnormal point and detection method
PFC error (Overvoltage/
Detailed
codes Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowing
a) Increase of DC bus voltage
to 430 V.
b) Decrease in PFC control
voltage to 12 V DC or lower
10
c) Increase in input current
U9
(W85V, W112V only)
(4220)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
20
DC bus voltage stays at 310 V or
lower for consecutive 10 seconds
(W85V, W112V only)
Overheat protection
Abnormal if TH3, condensing temperature
Ud
T detects 70: or more during com-
63HS
(1504)
pressor operation.
TH3: Thermistor <Liquid>
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
UE
and during defrosting.
(1302)
63HS: High pressure sensor
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
UF
(4100)
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.)
UH
• Abnormal if 40A (W85V, W112V) of input
(5300)
current is detected or 37A (W85V, W112V)
or more of input current is detected for 10
seconds continuously.
Low pressure (63L operated)(W112
only)
Abnormal if 63L is operated (under
-0.03MPa) during compressor operation.
63L: Low pressure switch
UL
(1300)
OCH681
Cause
1 Abnormal increase in power
source voltage
2 Decrease in power source
voltage, instantaneous stop
3 Disconnection of compressor
wiring
4 Misconnection of reactor
(DCL1-3)
5 Defective outdoor power circuit
board
6 Defective reactor (DCL1-3)
7 Disconnection or loose con-
nection of CN2 on the outdoor
power circuit board/controller
circuit board
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 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 Disconnection or contact
failure of connector (63HS) on
the outdoor controller circuit
board
2 Defective pressure sensor
3 Defective outdoor controller
circuit board
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 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 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
19
Judgment and action
12 Check the field facility for the power supply.
3 Correct the wiring (U•V•W phase) to
compressor. Refer to "9-6. TEST POINT
DIAGRAM". (Outdoor power circuit board).
4 Correct the wiring of reactor (DCL1-3).
5 Replace outdoor power circuit board.
6 Replace reactor (DCL1-3).
7 Check CN2 wiring.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit 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.
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.
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.
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.
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 "9-4. HOW TO CHECK THE
PARTS".