Mitsubishi Electric PUZ-HWM140VHA Service Manual page 20

9-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check Code Abnormal point and detection method
None
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously from being
switched on.
F5
63H: High pressure switch
(5201)
OCH748
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, L2 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
3 Electric power is not supplied
—
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (DCL
or ACL)
5 Disconnection of outdoor noise
filter circuit board or parts
failure in outdoor noise filter
circuit board
6 Defective outdoor power cir-
cuit board
7 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
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
3 Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Check connection of the connector and
CNDC on the outdoor power circuit board (V)/
noise filter circuit board(Y).
4 Check connection of reactor. (DCL or ACL)
5 a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.
6 Replace outdoor power circuit board.
7 Replace outdoor controller circuit board
(When items above are checked but the
units cannot be repaired.)
1 Check connection of 63H connector on
outdoor controller circuit board.
Refer to "9-7. 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.
20
Judgment and action