Error Codes (C.B.)
Code
Error
Cause
Action
None
―
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 supply terminal
c) Open phase (L or N phase)
Check following items.
a) Power supply breaker
b) Connection of power supply terminal
block (TB1)
c) Connection of power supply terminal
block (TB1)
Electric power is not charged to power
supply terminal of power circuit board.
a) Contact failure of power supply ter-
minal
b) Open phase on the power circuit
board
Check following items.
a) Connection of power supply terminal
block (TB1)
b) Connection of terminal on power cir-
cuit board
Check connection of the connector
LI or NI.
Electric power is not supplied to C.B.
a) Disconnection of connector (CNDC)
Check connection of the connector
(CNDC) on the C.B.
Check connection of the connector,
CNDC on the noise filter.
Disconnection of reactor (ACL)
Check connection of reactor. (ACL)
Disconnection of noise filter circuit
board or parts failure in noise filter
circuit board
a) Check connection of noise filter cir-
cuit board.
b) Replace noise filter circuit board.
Defective power circuit board
Replace power circuit board.
Defective C.B.
Replace C.B. (When items above are
checked but the units cannot be re-
paired).
Brine pump manual operation
Check DIP SW6-3 and turn it OFF.
Disconnection of wire between UNIT
SIDE and MODULE SIDE.
Refer to 'How to remove the module'.
Check connection of the wire between
UNIT SIDE and MODULE SIDE.
F5
(5201)
63H connector open
Abnormal if 63H connector circuit
is open for 3 minutes continuously
after power supply.
63H: High pressure switch
Disconnection or contact failure of 63H
connector on C.B.
Check connection of 63H connector on
C.B.
Disconnection or contact failure of 63H
Check the 63H side of connecting wire.
63H is working due to defective parts.
Check continuity by tester.
Replace the parts if the parts are defec-
tive.
Defective C.B.
Replace C.B.
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
Clogged or broken pipe
Check piping and repair defect.
Locked brine pump
- Check heat pump unit and repair defect.
Malfunction of brine pump
Short cycle of refrigerant or brine cir-
cuit
Dirt of brine circuit heat exchanger
Decreased brine flow rate
Check the brine flow rate.
Disconnection or contact failure of con-
nector (63H) on C.B.
-
Turn the power off and check F5 is
displayed when the power is turned
again.
Disconnection or contact failure of 63H
connection
Defective C.B.
Defective action of linear expansion
valve
Check linear expansion valve.
Malfunction of brine pump driving cir-
cuit
Replace C.B.
B-260
Water to Water Heat Pump (WTW)
7
Cylinder
unit/
Hydrobox/GSHP/WTW
Summary of Contents for EHWT17D-MHEDW
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