Service and Maintenance
7
48
en
Error Codes (C.B.)
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 supply 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 cir-
cuit board
Check connection of the connector LI
or NI.
3
Electric power is not supplied to C.B.
a) Disconnection of connector (CNDC)
3
Check connection of the connector
(CNDC) on the C.B.
4
Disconnection of reactor (DCL)
4
Check connection of reactor. (DCL)
5
Defective power circuit board
5
Replace power circuit board.
6
Defective C.B.
6
Replace C.B. (When items above are
checked but the units cannot be re-
paired).
7
Disconnection of wire between UNIT
SIDE and MODULE SIDE.
7
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
1
Disconnection or contact failure of 63H
connector on C.B.
1
Check connection of 63H connector on
C.B.
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 defec-
tive.
4
Defective C.B.
4
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
1
Clogged or broken pipe
1
Check piping and repair defect.
2
Short cycle of refrigerant or ambient
loop
2
-
3
Check heat pump unit and repair defect.
3
Dirt of ambient loop heat exchanger
4
Decreased ambient loop flow rate
4
Check the ambient loop flow rate.
5
Disconnection or contact failure of
connector (63H) on C.B.
5
-
7
Turn the power off and check F5 is
displayed when the power is turned
again.
6
Disconnection or contact failure of 63H
connection
7
Defective C.B.
8
Defective action of linear expansion
valve
8
Check linear expansion valve.
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