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Check Code
Abnormal point and detection method
To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs.
Detailed
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
codes
Refer to "8-7.OUTDOOR UNIT OPERATION MONITOR FUNCTION".
Overvoltage error
• Increase in DC bus voltage to
400 V
01
Undervoltage error
• Instantaneous decrease in DC
bus voltage to 200 V
02
Input current sensor error/
L1-phase open error
• Decrease in input current
through outdoor unit to 0.1A
U9
04
only if operation frequency is
(4220)
more than or equal to 40 Hz
or compressor current is more
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
more is detected on power
08
circuit board.
PFC error (Overvoltage/
Undervoltage/Overcurrent)
• PFC detected any of the fol-
lowing:
a) Increase of DC bus voltage
to 420 V.
10
b) Decrease in PFC control
voltage to 12 V DC or lower
c) Increase in input current to
50A peak
(For models equipped with
single-phase PFC only)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
20
DC bus voltage stays at 310 V
or lower for consecutive 10
seconds
OCH562D
Cause
1 Abnormal increase in power
source voltage
2 Disconnection of compressor
wiring
3 Defective outdoor power cir-
cuit 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
3 Defective converter drive
circuit in outdoor power circuit
board
4 Defective 52C drive circuit in
outdoor power circuit board
5 Disconnection or loose
connection of main smoothing
capacitor CB (only W112HA)
6 Disconnection or loose
connection of CN2 on the
outdoor power circuit
board/controller circuit board
7 Power circuit failure on DC
supply for 18 V DC output on
outdoor controller circuit board
1 Defective input current
detection circuit in outdoor
power circuit board
2Defective 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 synchronous
signal circuit in outdoor
controller circuit board
5 Defective power synchronous
signal circuit in outdoor power
circuit board
Not applicable for W112VHA
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
21
Judgment and action
1 Check the field facility for the power supply.
2 Correct the wiring (U . V . W phase) to com-
pressor. Refer to "8-6. TEST POINT
DIAGRAM (Outdoor power circuit board)".
3 Replace outdoor power circuit board.
4 Check compressor for electrical insulation.
Replace compressor.
1 Check the field facility for the power supply.
2 Check CN52C wiring.
3 Replace outdoor power circuit board.
4 Replace outdoor power circuit board.
5 Check CB wiring.
6 Check CN2 wiring.
7 Replace outdoor controller circuit board.
1 Replace outdoor power circuit board.
2 Replace outdoor controller circuit board.
1 Check the field 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.
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.
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