Check Code Abnormal point and detection method
Case
Judgment and action
23
U9
Detailed
codes
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.
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
Refer to "9-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION".
01
Overvoltage error
••Increase•in•DC•bus•voltage•to•
400 V
1
Abnormal increase in power source
voltage
2
Disconnection of compressor wiring
3
Defective outdoor power circuit board
4
Defective ACT module
5
Compressor has a ground fault.
1
Check the field facility for the power supply.
2
Correct the wiring (U.V.W phase) to
compressor. Refer to "9-6. TEST POINT
DIAGRAM" (Outdoor power circuit board).
3
Replace outdoor power circuit board.
4
Replace ACT module
5
Check compressor for electrical
insulation. Replace compressor.
02
Undervoltage error
••Instantaneous•decrease•in•DC•
bus voltage to 200 V
1
Decrease in power source voltage,
instantaneous stop.
2
Disconnection or loose connection of
CNAF on the outdoor power circuit
board/ACT module
3
Disconnection or loose connection
of CN52C on the outdoor noise filter
circuit board/controller circuit board
4
Defective ACT module drive circuit in
outdoor power circuit board
5
Defective ACT module
6
Defective 52C drive circuit in outdoor
noise filter circuit board
7
Disconnection or loose connection of
CN2 in outdoor power circuit board/
controller circuit board
8
Power circuit failure on DC supply for
18V DC output on outdoor controller
circuit board
1
Check the field facility for the power
supply.
2
Check CNAF wiring.
3
Check CN52 wiring.
4
Replace outdoor power circuit board.
5
Replace ACT module.
6
Replace outdoor noise filter circuit
board.
7
Check CN2 wiring.
8
Replace outdoor controller circuit board.
04
Input current sensor error
••Decrease•in•input•current•
through outdoor unit to 0.1 A
only if operation frequency is
more than or equal to 40 Hz
or compressor current is more
than or equal to 6 A.
1
Disconnection or loose connection of
CN5 on the outdoor power circuit board/
CNCT on the outdoor noise filter board
2
Defective ACCT (AC current trans) on
the outdoor noise filter circuit board
3
Defective input current detection
circuit in outdoor power circuit board
4
Defective outdoor controller circuit board
1
Check CN5/CNCT wiring.
2
Replace outdoor noise filter circuit
board.
3
Replace outdoor power circuit board.
4
Replace outdoor controller circuit board.
08
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
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
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.
10
PFC error (Overvoltage/
Undervoltage/Overcurrent)
••
PFC detected any of the following
a) Increase of DC bus voltage
to 420 V
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)
Not applicable for W85VHA2(R1)
models.
ACTM error (Undervoltage)
••
When Compressor is running,
DC bus voltage stays at 310 V or
lower for consecutive 10 seconds.
1
Incorrect switch settings on the outdoor
controller circuit board for model select
2
Disconnection or loose connection
of CNAF on the outdoor power
circuit board/ACT module
3
Defective ACT module drive circuit
of outdoor power circuit board
4
Defective ACT module
5
Disconnection or loose connection
of CN2 on the outdoor power circuit
board/controller circuit board
6
Power circuit failure on DC supply
for 18 V DC output on outdoor
controller circuit board
1
Correction of a model select
2
Check CNAF wiring.
3
Replace outdoor power circuit board.
4
Replace ACT module.
5
Check CN2 wiring.
6
Replace outdoor controller circuit board.
Check for the switch settings for model
select on the outdoor controller circuit
board.
20
OCH465D
