Mitsubishi Electric PUHZ-ZRP35VKA Service Manual page 46

From the previous page.
Abnormal point and detection method
Error Code
PFC/Q1 error (Overvoltage/
Detailed
codes
Undervoltage/Overcurrent)
• Increase of DC bus voltage to
35/50VKA: 400V
60/71VHA: 420V
• Decrease in PFC control volt-
age to 12V DC or lower
• Increase in input current to
10
50A peak
(ZRP35-71VHA)
U9
(4220)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at 310V
20
or lower for consecutive 10
seconds
(ZRP60/71VHA, ZRP100-
140VKA)
Over heat protection
Abnormal if outdoor pipe thermistor (TH3)
detects 70: or more during compressor
Ud operation.
(UD)*
(1504)
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
Abnormal if current sensor detects –1.0A
UH
to 1.0A during compressor operation. (This
(5300)
error is ignored in case of test run mode.)
OCH527B
Case
1 Abnormal increase in power
source voltage
2 Decrease in power source
voltage, instantaneous stop
3 Disconnection of compressor
wiring
4 Misconnection of reactor (ACL)
5 Defective outdoor power circuit
board
6 Defective reactor (ACL)
7 Disconnection or loose
connection 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 outdoor pipe
thermistor (TH3)
3 Defective outdoor controller
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
6 Dip switch setting difference of
outdoor controller circuit board.
1 Disconnection of compressor
wiring
2 Defective circuit of current
sensor on outdoor power circuit
board
46
Judgment and action
12 Check the field facility for the power
supply.
3 Correct the wiring (U . V . W phase) to
compressor. Refer to 11-9 (Outdoor
power circuit board).
4 Correct the wiring of reactor (ACL).
5 Replace outdoor power circuit board.
6 Replace reactor (ACL).
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 error code. If U4 is displayed, follow the
U4 processing direction.
* The check code in the parenthesis indicates
PAR-30MAA model.
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.
6 Check the dip switch setting of outdoor con-
troller circuit board.
Refer to "Model Select" in "1) Function of
switches" in 11-10.
1 Correct the wiring (U
V W phase) to
• •
compressor. Refer to 11-9 (Outdoor power
circuit board).
2 Replace outdoor power circuit board.