Mitsubishi Electric PUHZ-HRP71VHA Service Manual page 45

From the previous page.
Abnormal point and detection method
Error Code
Detailed
PFC error (Overvoltage/
codes
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowings
a) Increase in DC bus voltage
b) Decrease in PFC control
10
c) Increase in input current to
U9
50A peak
(4220)
(For models equipped with
single-phase PFC only)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at 310V
20
or lower for consecutive 10
seconds.
（HRP71, 100V only）
Overheat protection
Abnormal if outdoor pipe thermistor (TH3),
condensing temperature T
YHA2(R1)) detects 70: or more during
Ud
compressor operation.
(1504)
Abnormal pressure of pressure sensor
(63HS) (Only for HRP·HA2(R1,R2))
Abnormal if pressure sensor (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)
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 38A (HRP71, 100VHA)/40A
(5300)
(HRP71, 100VHA2) of input current is
detected or 34A (HRP71, 100VHA)/37A
(HRP71, 100VHA2) or more of input
current is detected for 10 seconds
continuously.
OCH425F
to 420V
voltage to 12V DC or lower
1 Defective outdoor fan (fan
(only V/
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
Case
Not applicable for HRP71, 100V
and HRP100/125Y 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 (only V/
63HS
YHA2(R1,R2))
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
45
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.
(Prssure sensor/ 63HS)
(SW2: Refer to 11-10.)
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 11-9 (Outdoor power circuit board).
4 Check compressor.
Refer to 11-6.
5 Replace outdoor power circuit board.
1 Correct the wiring (U
V W phase) to
• •
compressor. Refer to 11-9 (Outdoor power
circuit board).
2 Replace outdoor power circuit board.
3 Check the facility of power supply.