49
OCH722A
Error Codes (Controller circuit board)
Code
Error
Cause
Action
None
―
1.
No voltage is supplied to terminal block (TB1) of
heat pump unit.
a) Power supply breaker is turned off.
b) Contact failure or disconnection of power sup
-
ply terminal
c) Open phase (L or N phase)
1.
Check following items.
a) Power supply breaker
b) Connection of power supply terminal block (TB1)
c) Connection of power supply terminal block (TB1)
2.
Electric power is not charged to power supply
terminal of power circuit board.
a) Contact failure of power supply terminal
b) Open phase on the power circuit board
2.
Check following items.
a) Connection of power supply terminal block (TB1)
b) Connection of terminal on power circuit board
Check connection of the connector LI or NI.
3. Electric power is not supplied to controller circuit
board.
a) Disconnection of connector (CNDC)
3. Check connection of the connector (CNDC) on the
controller circuit board.
Check connection of the connector, CNDC on the
noise filter.
4.
Disconnection of reactor (ACL)
4.
Check connection of reactor. (ACL)
5.
Disconnection of noise filter circuit board or parts
failure in noise filter circuit board
5.
a) Check connection of noise filter circuit board.
b) Replace noise filter circuit board.
6.
Defective power circuit board
6.
Replace power circuit board.
7.
Defective controller circuit board
7.
Replace controller circuit board (When items
above are checked but the units cannot be re
-
paired).
8.
Brine pump manual operation
8.
Check DIP SW6-3 and turn it OFF.
9.
Disconnection of wire between UNIT SIDE and
MODULE SIDE.
9.
Refer to 'How to remove the module'. Check
connection of the wire between UNIT SIDE and
MODULE SIDE.
10. Wrong thermistor position
10. Check thermistor position and change to correct
position.
F5
(5201)
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously after power
supply.
63H: High pressure switch
1.
Disconnection or contact failure of 63H connec
-
tor on controller circuit board.
1.
Check connection of 63H connector on controller
circuit board.
2.
Disconnection or contact failure of 63H
2.
Check the 63H side of connecting wire.
3. 63H is working due to defective parts.
3. Check continuity by tester.
Replace the parts if the parts are defective.
4.
Defective controller circuit board
4.
Replace controller circuit board.
U1
(1302)
High pressure (High pressure switch
63H operated)
Abnormal if high pressure switch 63H
operated (4.15 MPa) during compressor
operation.
63H: High pressure switch
1.
Clogged or broken pipe
1.
Check piping and repair defect.
2.
Locked brine pump
2. to 5.
3. Malfunction of brine pump
Check heat pump unit and repair defect.
4.
Short cycle of refrigerant or brine circuit
5.
Dirt of brine circuit heat exchanger
6.
Decreased brine flow rate
6.
Check the brine flow rate.
7.
Disconnection or contact failure of connector
(63H) on controller circuit board
7. to 9.
Turn the power off and check F5 is displayed
when the power is turned again.
8.
Disconnection or contact failure of 63H connec
-
tion
9.
Defective controller circuit board
10. Defective action of linear expansion valve
10. Check linear expansion valve.
11.
Malfunction of brine pump driving circuit
11.
Replace controller circuit board.
U2
(1102)
High discharge temperature
(1) Abnormal if TH4 exceeds 125°C or
110°C continuously for 5 minutes.
(2) Abnormal if discharge superheat
(Heating: TH4−T63HS) exceeds 70°C
continuously for 10 minutes.
TH4: Thermistor <Discharge>
High comp. surface temperature
Abnormal if TH33 exceeds 125°C.
In the case of high comp. surface tempera
-
ture error, compressor does not restart
unless the thermistor (TH33) becomes less
than 95°C.
TH33: Thermistor <Comp. surface>
1.
Overheated compressor operation caused by
shortage of refrigerant
1.
Check intake superheat.
Check leakage of refrigerant.
Charge additional refrigerant.
2.
Defective thermistor
2., 3.
3. Defective controller circuit board
Turn the power off and check if U3 is displayed
when the power is turned on again.
When U3 is displayed, refer to 'Judgment and ac
-
tion' for U3.
4.
Defective action of linear expansion valve
4.
Check linear expansion valve.
5.
Clogging with foreign objects in refrigerant circuit
Note:
Clogging occur in the parts which become below
freezing point when water enters in refrigerant
circuit.
5.
After recovering refrigerant, remove water from
entire refrigerant circuit under vacuum more than
1 hour.
6.
In the case of the unit does not restart:
Detection temp. of thermistor (TH33)
]
95°C
U3
(5104)
Open/short circuit of heat pump unit
temperature thermistor (TH4, TH33)
Abnormal if open (3°C or less) or short (217°C
or more) is detected during compressor
operation.
(Detection is inoperative for 10 minutes
of compressor starting process and for 10
minutes after and during defrosting.)
TH4: Thermistor <Discharge>
TH33: Thermistor <Comp. surface>
1.
Disconnection or contact failure of connectors
(TH4, TH33) on the controller circuit board
1.
Check connection of connector (TH4, TH33) on the
controller circuit board.
Check breaking of the lead wire for TH4, TH33.
2.
Defective thermistor
2.
Check resistance value of TH4, TH33 or tempera
-
ture by microprocessor.
3. Defective controller circuit board
3. Replace controller circuit board.
Summary of Contents for EHGT17D-YM9ED
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