Mitsubishi Electric Mr.Slim PUHZ-SHW80VHA Service Manual page 29

From the previous page.
Abnormal point and detection method
Error Code
PFC error (Overvoltage/
Detailed
codes Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowings
a) Increase of DC bus voltage
10
b) Decrease in PFC control
c) Increase in input current to
50A peak
U9
(For models equipped with
(4220)
single-phase PFC only)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
20 DC bus voltage stays at 310V or
lower for consecutive 10 seconds
(SHW80, 112VHA only)
Overheat protection
Abnormal if outdoor pipe thermistor (TH3),
condensing temperature T
Ud
70: or more during compressor opera-
(1504)
tion.
Abnormal pressure of pressure sensor
(63HS)
Abnormal if pressure sensor (63HS)
detects 0.1 MPa or less.
UE
Detection is inoperative for 3 minutes after
(1302)
compressor starting and 3 minutes after
and during defrosting.
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 (SHW80,112V) of input
(5300)
current is detected or 37A (SHW80,112V)
or more of input current is detected for 10
seconds continuously.
Low pressure (63L operated)
Abnormal if 63L is operated (under
-0.03MPa) during compressor operation.
63L: Low-pressure switch
UL
(1300)
OCH526
to 420V.
voltage to 12V DC or lower
1 Defective outdoor fan (fan
detects
63HS
2 Defective outdoor pipe
3 Defective outdoor controller board
1 Disconnection or contact
2 Defective pressure sensor
3 Defective outdoor controller
1 Stop valve is closed.
2 Decrease of power supply
3 Looseness, disconnection or
4 Defective compressor
5 Defective outdoor power board
1 Disconnection of compressor
2 Defective circuit of current
3 Decrease of power supply
1 Stop valve of outdoor unit is
2 Disconnection or loose
3 Disconnection or loose
4 Defective outdoor controller
5 Leakage or shortage of
6 Malfunction of linear expansion
Case
Not applicable for SHW80,
112VHA and SHW112, 140YHA
models.
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
motor) or short cycle of outdoor
unit during cooling operation
thermistor (TH3), condensing
temperature T
63HS
failure of connector (63HS) on
the outdoor controller circuit
board
circuit board
voltage
converse of compressor wiring
connection
wiring
sensor on outdoor power circuit
board
voltage
closed during operation.
connection of connector (63L)
on outdoor controller board
connection of 63L
board
refrigerant
valve
29
Judgment and action
Check for the switch settings for Model Select
on the outdoor controller circuit board.
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 error 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
thermistor (63HS).
2 Check pressure by microprocessor.
(Pressure sensor/ 63HS)
(SW2: Refer to 9-10.)
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 9-9 (Outdoor power circuit board).
4 Check compressor.
Refer to 9-6.
5 Replace outdoor power circuit board.
1 Correct the wiring (U
V W phase) to
• •
compressor. Refer to 9-9 (Outdoor power
circuit board).
2 Replace outdoor power circuit board.
3 Check the facility of power supply.
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 9-6.