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8-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check Code
Abnormal point and detection method
None
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously from being
switched on.
63L: Low pressure switch
F3
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously from being
switched on.
63H: High pressure switch
F5
2 connector open
Abnormal if both 63H and 63L connector
circuits are open for 3 minutes continu-
ously from being switched on.
F9
63H: High pressure switch
63L: Low pressure switch
OCH562D
1 No voltage is supplied to
terminal block (TB1) of
outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or
disconnection of power
supply terminal
c) Open phase (L or N phase)
2 Electric power is not charged
to power supply terminal of
outdoor power circuit board.
a) Contact failure of power
supply terminal
b) Open phase on the outdoor
power circuit board
Disconnection of connector
—
LI, NI
3 Electric power is not supplied
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (DCL)
5 Defective outdoor power cir-
cuit board
6 Defective outdoor controller
circuit board
1 Disconnection or contact fail-
ure of 63L connector on out-
door controller circuit board
2 Disconnection or contact fail-
ure of 63L
3 63L is working due to refriger-
ant leakage or defective parts.
4 Defective outdoor controller
circuit board
1 Disconnection or contact fail-
ure of 63H connector on out-
door controller circuit board
2 Disconnection or contact fail-
ure of 63H
3 63H is working due to defec-
tive parts.
4 Defective outdoor controller
circuit board
1 Disconnection or contact
failure of connector (63H,63L)
on outdoor controller circuit
board.
2 Disconnection or contact fail-
ure of 63H, 63L
3 63H and 63L are working due
to defective parts.
4 Defective outdoor controller
board
17
Cause
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 Check following items.
a) Connection of power supply terminal
block (TB1)
b) Connection of terminal on outdoor power
circuit board
Check connection of the connector LI or NI.
Refer to "8-6. TEST POINT DIAGRAM".
3 Check connection of the connector CNDC on
the outdoor controller circuit board.
Check connection of the connector CNDC
on the outdoor power circuit board. Refer to
"8-6. TEST POINT DIAGRAM".
4 Check connection of reactor. (DCL)
Check connection of "DCL1" and "DCL2" on
the outdoor power circuit board.
5 Replace outdoor power circuit board.
6 Replace outdoor controller circuit board.
(When items above are checked but the
units cannot be repaired.)
1 Check connection of 63L connector on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2 Check the 63L side of connecting wire.
3 Check refrigerant pressure.
Charge additional refrigerant.
Check continuity of 63L.
Replace low pressure switch if it is defective.
4 Replace outdoor controller circuit board.
1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2 Check the 63H side of connecting wire.
3 Check for continuity of 63H.
Replace high pressure switch if it is defec-
tive.
4 Replace outdoor controller circuit board.
1 Check connection of connector (63H,63L) on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2 Check the 63H and 63L side of connecting
wire.
3 Check continuity of 63H and 63L.
Replace the pressure switch if it is defective.
4 Replace outdoor controller circuit board.
Judgment and action
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