Mitsubishi Electric PUHZ-HRP71VHA Service Manual page 44

Abnormal point and detection method
Error Code
To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5, 2-6 when U9 error occurs.
Detailed
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6.
codes
Refer to 11-10.
Overvoltage error
• Increase in DC bus voltage to
HRP71, 100V ： 400V
HRP100, 125Y ： 760V
01
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
HRP71, 100V ： 200V
HRP100, 125Y ： 350V
02
U9
(4220)
Input current sensor error/
L -phase open error
1
• Decrease in input current
through outdoor unit to 0.1A
only if operation frequency is
more than or equal to 40Hz
or compressor current is more
04
than or equal to 6A.
Abnormal power synchronous
signal
• No input of power synchronous
signal to power circuit board
• Power synchronous signal
of 44 Hz or less, or 65 Hz or
08
more is detected on power
circuit board.
OCH425F
Case
1 Abnormal increase in power source
voltage
2 Disconnection of compressor wiring
3 Defective outdoor power circuit
board
4 Compressor has a ground fault.
1 Decrease in power source voltage,
instantaneous stop.
2 Disconnection or loose connection
of CN52C on the outdoor power
circuit board/controller circuit board
(HRP71, 100V)
3 Defective converter drive circuit of
outdoor power circuit board (HRP71,
100V)
4 Defective 52C drive circuit in outdoor
power circuit board
5 Defective outdoor converter circuit
board (HRP100, 125Y)
6 Disconnection or loose connection
of rush current protect resistor RS
(HRP100, 125Y)
7 Defective rush current protect
resistor RS (HRP100, 125Y)
8 Disconnection or loose connection
of main smoothing capacitor CB
(HRP71, 100V)/CB1,CB2 (HRP100,
125Y)
9 Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
(HRP71, 100V)
0 Power circuit failure on DC supply for
18V DC output on outdoor controller
circuit board (HRP71, 100V)
1 L
-phase open (HRP100, 125Y)
1
2 Disconnection or loose connection
between TB1 and outdoor noise fi lter
circuit board (HRP100, 125Y)
3 Disconnection or loose connection
of CN5 on the outdoor power circuit
board/CNCT on the outdoor noise
fi lter board (HRP100, 125Y)
4 Defective ACCT(AC current trans) on
the outdoor noise fi lter circuit board
(HRP100, 125Y)
5 Defective input current detection
circuit of outdoor power circuit board
6 Defective outdoor controller circuit board
1 Distortion of power source voltage,
noise superimposition.
2 Disconnection or loose connection of
earth wiring
3 Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
4 Defective power synchrous signal
circuit in outdoor controller circuit
board
5 Defective power synchrous signal
circuit in outdoor power circuit board
44
Judgment and action
1 Check the field facility for the power
supply.
2 Correct the wiring (U . V . W phase) to
compressor. Refer to 11-9 (Outdoor
power circuit board).
3 Replace outdoor power circuit board.
4 Check compressor for electrical insula-
tion. Replace compressor.
1 Check the fi eld facility for the power
supply.
2 Check CN52C wiring. (HRP71, 100V)
3 Replace outdoor power circuit board.
(HRP71, 100V)
4 Replace outdoor power circuit board.
5 Replace outdoor converter circuit board.
(HRP100, 125Y)
6 Check RS wiring. (HRP100, 125Y)
7 Replace RS. (HRP100, 125Y)
8 Check CB wiring. (HRP71, 100V)/Check
CB1,CB2 wiring. (HRP100, 125Y)
9 Check CN2 wiring. (HRP71, 100V)
0 Replace outdoor controller circuit board.
(HRP71, 100V)
1 Check the fi eld facility for the power
supply. (HRP100, 125Y)
2 Check the wiring between TB1 and
outdoor noise fi lter circuit board
(HRP100, 125Y)
3 Check CN5/CNCT wiring. (HRP100,
125Y)
4 Replace outdoor noise fi lter circuit
board. (HRP100, 125Y)
5 Replace outdoor power circuit board.
6 Replace outdoor controller circuit board.
1 Check the fi eld facility for the power
supply.
2 Check earth wiring.
3 Check CN2 wiring.
4 Replace outdoor controller circuit board.
5 Replace outdoor power circuit board.
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