51
OCH722A
Code
Error
Cause
Action
U9
(4220)
Detailed
codes
Input current sensor error/
L1-phase open error
• Decrease in input current
through heat pump unit
to 0.1A only if operation
frequency is more than or
equal to 40Hz or compres
-
sor current is more than or
equal to 6A.
1.
L1-phase open
1.
Check the field facility for the power supply.
04
2.
Disconnection or loose connection between TB1
and noise filter circuit board
2.
Check the wiring between TB1 and noise filter
circuit board.
3. Disconnection or loose connection of CN5 on
the power circuit board/CNCT on the noise filter
board
3. Check CN5/CNCT wiring.
4.
Defective ACCT (AC current trans) on the noise
filter circuit board
4.
Replace noise filter circuit board.
5.
Defective input current detection circuit in power
circuit board
5.
Replace power circuit board.
6.
Defective controller circuit board
6.
Replace 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.
1.
Check the field facility for the power supply.
2.
Disconnection or loose connection of earth
wiring
2.
Check earth wiring.
3. Disconnection or loose connection of CN2 on
the power circuit board /controller circuit board
3. Check CN2 wiring.
4.
Defective power synchronous signal circuit in
controller circuit board
4.
Replace controller circuit board.
5.
Defective power synchronous signal circuit in
power circuit board
5.
Replace power circuit board.
UE
(1302)
Abnormal pressure of 63HS
Abnormal if 63HS detects 0.1 MPa or less.
Detection is inoperative for 3 minutes after
compressor starting and 3 minutes after
and during defrosting.
63HS: High pressure sensor
1.
Disconnection or contact failure of connector
(63HS) on the controller circuit board
1.
Check connection of connector (63HS) on the
controller circuit board.
Check breaking of the lead wire for 63HS.
2.
Defective pressure sensor
2.
Check pressure by microprocessor.
(Pressure sensor/ 63HS)
3. Defective controller circuit board
3. Replace controller circuit board.
UL
(1300)
Low pressure
Abnormal if TH33-TH4 exceeds 20°C
and
TH33 exceeds 80°C during compressor
operation.
1.
Defective linear expansion valve.
1.
Check linear expansion valve.
2.
Defective controller circuit board
2.
Replace controller circuit board.
UF
(4100)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or com
-
pressor is detected within 30 seconds after
compressor starts operating.
1.
Decrease of power supply voltage
1.
Check facility of power supply.
2.
Looseness, disconnection or converse of com
-
pressor wiring connection
2.
Correct the wiring (U•V•W phase) to compressor.
3. Defective compressor
3. Check compressor.
4.
Defective power board
4.
Replace power circuit board.
UH
(5300)
Current sensor error or input current error
• Abnormal if current sensor detects –1.0A
to 1.0A during compressor operation.
(This error is ignored in case of test run
mode.)
• Abnormal if 40A of input current is de
-
tected or 37A or more of input current is
detected for 10 seconds continuously.
1.
Disconnection of compressor wiring
1.
Correct the wiring (U•V•W phase) to compressor.
2.
Defective circuit of current sensor on power
circuit board
2.
Replace power circuit board.
3. Decrease of power supply voltage
3. Check the facility of power supply.
4.
Leakage or shortage of refrigerant
4.
Check leakage of refrigerant.
UA
(2511)
Low brine flow rate (flow switch operated)
Abnormal if flow switch is operated (under
5.5L/min) during compressor operation.
1.
Valve of brine circuit is closed during operation.
1.
Check valve.
2.
Disconnection or loose connection of connector
(63L) on controller circuit board
2. to 4.
Turn the power off and on again to check if F3 is
displayed on restarting.
If F3 is displayed, follow the F3 processing direction.
3. Disconnection or loose connection of 63L
4.
Defective controller circuit board
5.
Leakage or shortage of brine
5.
Correct to proper amount of refrigerant.
UP
(4210)
Compressor overcurrent interruption
Abnormal if overcurrent DC bus or com
-
pressor is detected after compressor starts
operating for 30 seconds.
1.
Decrease of power supply voltage
1.
Check facility of power supply.
2.
Looseness, disconnection or converse of
compressor wiring connection
2.
Correct the wiring (U·V·W phase) to compressor.
Refer to "9-7.TEST POINT DIAGRAM" (Power
circuit board).
3. Defective pump of heat pump unit
3. Check pump.
4.
Defective input circuit of controller circuit board
4.
Replace controller circuit board.
Note: Before the replacement of the controller
circuit board, disconnect the wiring to
compressor from the power circuit board
and check the output voltage among
phases, U, V, W, during test run.
No defect on board if voltage among
phases (U-V, V-W and W-U) is same.
Make sure to perform the voltage check
with same performing frequency.
5.
Defective compressor
5.
Check compressor. Refer to "9-6. Checking
component parts' function".
6.
Defective power circuit board
6.
Replace power circuit board.
7.
DIP switch setting difference of controller circuit
board
7.
Check the DIP switch setting of controller circuit
board.
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