Mitsubishi Electric PUHZ-SW50VHA Service Manual page 20

10-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is put 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.
63H: High-pressure switch
F5
OCH525C
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 supplied 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
terminal on outdoor power circuit
board)
3 Electric power is not supplied to
outdoor controller circuit board.
a) Disconnection of connector
(CNDC)
4 Disconnection of reactor (ACL)
—
5 Disconnection of outdoor noise
filter circuit board or parts failure
in outdoor noise filter circuit board
(SW40/50VHA(R1) only)
6 Defective outdoor power circuit
board (SW40/50VHA(R1) only)
7 Defective outdoor controller circuit
board
1 Disconnection or contact failure of
63H connector on outdoor control-
ler circuit board
2 Disconnection or contact failure of
63H
3 63H is working due to defective
parts.
4 Defective outdoor controller circuit
board
Note: Refer to indoor unit section for code P and code E.
Case
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, LD1 and
LD2 for SW40/50VHA on the outdoor power
circuit board. Refer to "10-9. TEST POINT
DIAGRAM".
4 Check connection of reactor (ACL).
Check connection of "LO" and
"NO" on the outdoor noise filter circuit
board for SW40/50VHA.
Check connection of "R" and "S" on the
outdoor power circuit board for SW40/50VHA.
Refer to "10-9. TEST POINT DIAGRAM".
Check connection of reactor for SW50VKA.
Refer to "7. WIRING DIAGRAM".
5 a) C heck connection of outdoor noise fil-
b) Replace outdoor noise filter circuit board
Refer to "10-9. TEST POINT DIAGRAM".
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 "10-9. TEST POINT DIAGRAM".
2 Check the 63H side of connecting wire.
3 Check continuity by tester.
Replace the parts if the parts are defective.
4 Replace outdoor controller circuit board.
20
Judgment and action
ter circuit board for SW40/50VHA.
for SW40/50VHA.