46
Check Code Abnormal point and detection method
Case
Judgment and action
U9
(4220)
Detailed
codes
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2 and 2-6.
Refer to "11-10. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS".
01
Overvoltage error
• Increase in DC bus voltage to
ZRP35/50VKA: 400 V
ZRP60/71VHA: 420 V
ZRP100-140VKA: 400 V
ZRP100-140YKA: 760 V
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
Check the field facility for the power supply.
2
Correct the wiring (U.
V
.W phase) to
compressor. Refer to "11-9. TEST
POINT DIAGRAM". (Outdoor power cir
-
cuit board).
3
Replace outdoor power circuit board.
4
Check compressor for electrical insula
-
tion. Replace compressor.
02
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
ZRP35-140V: 200 V
ZRP100-140Y: 350 V
1
Decrease in power source voltage,
instantaneous stop.
2
Disconnection or loose connection of
CN52C on the outdoor power circuit board/
controller circuit board (ZRP60-140V)
3
Defective converter drive circuit in
outdoor power circuit board (ZRP60-
140V) / outdoor controller circuit boad
(ZRP35/50)
4
Defective 52C drive circuit in outdoor
power circuit board
5
Defective outdoor converter circuit
board (ZRP·YKA)
6
Disconnection or loose connection
of rush current protect resistor RS
(ZRP·YKA)
7
Defective rush current protect
resistor RS (ZRP·YKA)
8
Disconnection or loose connection
of main smoothing capacitor CB
(ZRP100-140VKA)
9
Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
(ZRP100-140VKA)
0
Power circuit failure on DC supply for
18V DC output on outdoor controller
circuit board (ZRP100-140VKA)
1
Check the field facility for the power
supply.
2
Check CN52C wiring. (ZRP60-140V)
3
Replace outdoor power circuit board
(ZRP60-140V) / outdoor controller cir
-
cuit boad (ZRP35/50)
4
Replace outdoor power circuit board.
5
Replace outdoor converter circuit
board. (ZRP·YKA)
6
Check RS wiring. (ZRP·YKA)
7
Replace RS. (ZRP·YKA)
8
Check CB wiring. (ZRP·YKA)
9
Check CN2 wiring. (ZRP100-140VKA)
0
Replace outdoor controller circuit board.
(ZRP100-140VKA)
04
Input current sensor error/
L1-phase open error
• 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
than or equal to 6A.
1
L1-phase open (ZRP·YKA)
2
Disconnection or loose connection
between TB1 and outdoor noise filter
circuit board (ZRP·YKA)
3
Disconnection or loose connection
of CN5 on the outdoor power circuit
board/CNCT on the outdoor noise
filter board (ZRP60/71VHA, ZRP·YKA)
4
Defective ACCT (AC current trans)
on the outdoor noise filter circuit
board (ZRP60/71VHA, ZRP·YKA)
5
Defective input current detection
circuit in outdoor power circuit board
6
Defective outdoor controller circuit
board
1
Check the field facility for the power
supply. (ZRP·YKA)
2
Check the wiring between TB1 and
outdoor noise filter circuit board.
(ZRP·YKA)
3
Check CN5/CNCT wiring. (ZRP60/
71VHA, ZRP·YKA)
4
Replace outdoor noise filter circuit
board. (ZRP60/71VHA, ZRP·YKA)
5
Replace outdoor power circuit board.
6
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.
Continue to the next page.
OCH527C
