Mitsubishi Electric PUZ-WZ50VAA Service Manual page 32

9-2. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check code Abnormal points and detection method
None
63H connector open
Abnormal if 63H connector circuit is open for
3 minutes continuously after power supply.
F5
63H: High pressure switch
(5201)
OCH816
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)
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
Electric power is not supplied to
outdoor controller circuit board.
a) Disconnection of connector
—
(CNDC)
Disconnection of reactor (DCL
or ACL)
Disconnection of outdoor noise
filter circuit board or parts failure
in outdoor noise filter circuit
board
Defective outdoor power circuit
board
Open of rush current protect
resistor(RS)(Y)
Defective outdoor controller
circuit board
Disconnection or contact failure
of 63H connector on outdoor
controller circuit board
Disconnection or contact failure
of 63H
63H is working due to defective
parts.
Defective outdoor controller
circuit board
Note: Refer to indoor unit section for code P, code E, and Code L.
Cause
Check following items.
a) Power supply breaker
b) Connection of power supply terminal block
(TB1)
c) Connection of power supply terminal block
(TB1)
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 "9-6.TEST POINT DIAGRAM".
Check connection of the connector (CNDC)
on the outdoor controller circuit board.
Check connection of the connector, CNDC
on the outdoor power circuit board(V)/the
noise filter(Y). Refer to "9-6.TEST POINT
DIAGRAM".
Check connection of reactor. (DCL or ACL)
Refer to "9-6.TEST POINT DIAGRAM".
a) Check connection of outdoor noise filter
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to "9-6.TEST POINT DIAGRAM".
Replace outdoor power circuit board.
Replace rush current protect resistor(RS).
Power circuit board might be short-circuit.
Check the power circuit board.(Refer to "9-6.
TEST POINT DIAGRAM".)
Replace controller board (When items above
are checked but the units cannot be repaired).
Check connection of 63H connector on
outdoor controller circuit board.
Refer to "9-6.TEST POINT DIAGRAM".
Check the 63H side of connecting wire.
Check continuity by tester.
Replace the parts if the parts are defective.
Replace outdoor controller circuit board.
32
judgment and action