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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
W50V: 400 V
01
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
W50V: 200 V
02
Input current sensor error
• Decrease in input current
through outdoor unit to 0.1 A
04
only if operation frequency is
more than or equal to 40 Hz
or compressor current is more
than or equal to 6 A.
Abnormal power synchronous
signal
U9
• 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.
PFC error (Overvoltage/
Overcurrent)
• PFC detected any of the fol-
lowing
a) Increase of DC bus voltage
to 400 V.
b) Increase in input current to
10
50A peak
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
DC bus voltage stays at 310 V or
lower for consecutive 10 seconds
20
(For models equipped with
single-phase PFC only)
OCH605A
Case
1 A bnormal increase in power
source voltage
2 Disconnection of compressor wiring
3 D efective outdoor power circuit board
4 Compressor has a ground fault.
1 D ecrease in power source
voltage, instantaneous stop.
2 Defective converter drive cir-
cuit in outdoor power circuit
board
3 D efective 52C drive circuit in
outdoor power circuit board
4 D isconnection or loose con-
nection of CN2 on the outdoor
power circuit board/controller
circuit board
5 P ower circuit failure on DC
supply for 15 V DC output
on outdoor controller circuit
board
1 D efective input current detec-
tion circuit in outdoor power
circuit board
2 D efective outdoor controller
circuit board
1 Distortion of power source
voltage, noise superimposi-
tion.
2 Disconnection or loose con-
nection of earth wiring
3 Disconnection or loose con-
nection of CN2 on the outdoor
power circuit board /controller
circuit board
4 Defective power synchronous
signal circuit in outdoor con-
troller circuit board
5 Defective power synchronous
signal circuit in outdoor power
circuit board
1 A bnormal increase in power
source voltage
2 Decrease in power source
voltage, instantaneous stop
3 D isconnection of compressor
wiring
4 Misconnection of reactor (ACL)
5 Defective outdoor power circuit
board
6 Defective reactor (ACL)
7 Disconnection or loose con-
nection of CN2 on the outdoor
power circuit board/controller
circuit board
Not applicable for SW50VHA2
18
Judgment and action
1 Check the field facility for the power supply.
2 Correct the wiring (U . V . W phase) to
compressor. Refer to "8-6. TEST POINT
DIAGRAM" (Outdoor power circuit board).
3 R eplace outdoor power circuit board.
4 C heck compressor for electrical insulation.
Replace compressor.
1 C heck the field facility for the power supply.
23 Replace outdoor power circuit board.
4 C heck CN2 wiring.
5 Replace outdoor controller circuit board.
1 Replace outdoor power circuit board.
2 Replace outdoor controller circuit board.
1 C heck 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.
12 Check the field facility for the power supply.
3 Correct the wiring (U·V·W phase) to com-
pressor. Refer to "8-6. TEST POINT
DIAGRAM" (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.
Check for the switch settings for model select
on the outdoor controller circuit board.
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