Mitsubishi Electric PUZ-SM100VKA2 Service Manual page 29

9-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is ON>
Abnormal points and detection method
Check code
None
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously after power sup-
ply.
63H: High pressure switch
F5
(5201)
Note: Refer to indoor unit section for code P and code E.
OCH774A
No voltage is supplied to termi-
nal block (TB1) of outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or disconnec-
tion of power supply terminal
c) Open phase (L, L2 or N
phase)
Electric power is not supplied
to power supply terminal of out-
door power circuit board.
a) Contact failure of power
supply terminal
b) Open phase on the outdoor
power circuit board
(Disconnection of terminal
on 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 power
—
circuit board (PUZ-SM·VKA2)/
outdoor noise filter circuit board
(PUZ-SM·YKA2) or parts fail-
ure in outdoor power circuit
board (PUZ-SM·VKA2)/outdoor
noise filter circuit board (PUZ-
SM·YKA2)
Defective outdoor power circuit
board
Open of rush current protect
resistor (RS) (PUZ-SM·YKA2)
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
Cause
Refer to "9-8. TEST POINT DIAGRAM".
29
Judgment and action
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 (CNDC)
on the outdoor controller circuit board.
Refer to "9-8. TEST POINT DIAGRAM".
Check connection of reactor. (DCL or ACL)
Refer to "6. WIRING DIAGRAM".
a) Check connection of outdoor power circuit
board (PUZ-SM·VKA2)/outdoor noise filter
circuit board (PUZ-SM·YKA2).
b) Replace outdoor power circuit board
(PUZ-SM·VKA2)/outdoor noise filter circuit
board (PUZ-SM·YKA2).
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
"9-8. 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 "9-8. 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.