Error Code
Abnormal point and detection method
Case
Judgment and action
54
U9
(4220)
Detailed
codes
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.
To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6.
Refer to 11-10.
01
Overvoltage error
• Increase in DC bus voltage to
P·VHA model: 400V
P·YHA model: 760V
1
Abnormal increase in power source
voltage
2
Disconnection of compressor wiring
3
Defective outdoor power circuit board
4
Defective ACT Module
(P·VHA2
(1)
/P·VHA3(R1))
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 11-9 (Outdoor
power circuit board).
3
Replace outdoor power circuit board.
4
Replace ACT Module.
(P·VHA2
(1)
/P·VHA3(R1))
5
Check compressor for electrical
insulation. Replace compressor.
02
Undervoltage error
• Instantaneous decrease in DC
bus voltage to
P·VHA model: 200V
P·YHA model: 350V
1
Decrease in power source voltage,
instantaneous stop.
2
Disconnection or loose connection
of CN52C on the outdoor power
circuit board/controller circuit board
(P·VHA3R2/VHA4)
3
Disconnection or loose connection
of CN52C on the outdoor noise fi lter
circuit board/controller circuit board
(P·VHA2
(1)
/VHA3(R1))
4
Defective converter drive circuit
of outdoor power circuit board
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4)
5
Defective 52C drive circuit in outdoor
power circuit board (P·VHA3R2/
VHA4)/noise fi lter circuit board
(P·VHA2
(1)
/VHA3(R1) & P·YHA(R1/
R2)/YHA2(R1))
6
Disconnection or loose connection
of rush current protect resistor RS
(P·YHA(R1/R2)/YHA2(R1))
7
Defective rush current protect resistor
RS (P·YHA(R1/R2)/YHA2(R1))
8
Disconnection or loose connection
of main smoothing capacitor CB
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4)/
CB1,CB2(P·YHA(R1/R2))
9
Disconnection or loose connection
of CN2 on the outdoor power circuit
board /controller circuit board
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4)
0
Power circuit failure on DC supply for
18V DC output on outdoor controller
circuit board (P·VHA2
(1)
/VHA3(R1/
R2)/VHA4)
1
Check the fi eld facility for the power
supply.
23
Check CN52C wiring. (P·VHA2
(1)
/
VHA3(R1/R2)/VHA4)
4
Replace outdoor power circuit board.
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4)
5
Replace outdoor power circuit board.
(P·VHA3R2/VHA4)/Replace outdoor
noise fi lter circuit board. (P·VHA2
(1)
/
VHA3R1 & P·YHA(R1/R2)/YHA2(R1))
6
Check RS wiring. (P·YHA(R1/R2)/
YHA2(R1))
7
Replace RS. (P·YHA(R1/R2)/YHA2(R1))
8
Check CB or CB1,CB2 wiring.
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4 &
P·YHA(R1/R2))
9
Check CN2 wiring. (P·VHA2
(1)
/
VHA3(R1/R2)/VHA4)
0
Replace outdoor controller circuit board.
(P·VHA2
(1)
/VHA3(R1/R2)/VHA4)
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 (P·YHA(R1/R2)/
YHA2(R1))
2
Disconnection or loose connection
between TB1 and outdoor noise fi lter
circuit board (P·YHA(R1/R2)/YHA2(R1))
3
Disconnection or loose connection
of CN5 on the outdoor power circuit
board/CNCT on the outdoor noise fi lter
board (P·YHA(R1/R2)/YHA2(R1))
4
Defective ACCT(AC current trans) on
the outdoor noise fi lter circuit board
(P·YHA(R1/R2)/YHA2(R1))
5
Defective input current detection
circuit of outdoor power circuit board
6
Defective outdoor controller circuit board
1
Check the fi eld facility for the power
supply. (P·YHA(R1/R2)/YHA2(R1))
2
Check the wiring between TB1 and
outdoor noise fi lter circuit board
(P·YHA(R1/R2)/YHA2(R1))
3
Check CN5/CNCT wiring. (P·YHA(R1/
R2)/YHA2(R1))
4
Replace outdoor noise fi lter circuit
board. (P·YHA(R1/R2)/YHA2(R1))
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 synchrous signal
circuit in outdoor controller circuit board
5
Defective power synchrous signal
circuit in outdoor power 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.
Continue to the next page.
OCH415G