Mitsubishi Electric PUZ-A12NKA7 Service Manual page 31

10-4. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check code Abnormal points and detection method
None
OCH636A
1 No voltage is supplied to terminal
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 (L1 or L2 phase)
2 Electric power is not charged 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
A12–A24N: Disconnection of
A30–A42N: Disconnection of
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 fail-
ure in outdoor noise filter circuit
board
As for A30–A42N type, it is
especially needed to check the
resistance RS1 on the noise
filter circuit board.
6 Defective outdoor power circuit
board
7 Defective outdoor controller
circuit board
Note: Refer to indoor unit section for code P and code E.
Case
1 Check following items.
2 Check following items.
connector R or S
connector TABT or
TABS
3 Check connection of the connector (CNDC)
4 Check connection of reactor. (DCL or ACL)
5 a) Check connection of outdoor noise filter
6 Replace outdoor power circuit board.
7 Replace controller board (When items above
31
judgment and action
a) Power supply breaker
b) Connection of power supply terminal block
(TB1)
c) Connection of power supply terminal block
(TB1)
a) Connection of power supply terminal block
(TB1)
b) Connection of terminal on outdoor power
circuit board
A12–A24N: Disconnection of connector R or S
Refer to "10-9. TEST POINT
DIAGRAM".
A30–A42N: Disconnection of connector TABT or
TABS
Refer to "10-9. TEST POINT
DIAGRAM".
on the outdoor controller circuit board.
Check connection of the connector, LD1 and
LD2 for A12–A24N and CNDC for A30–A36N,
on the outdoor power circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
A12–A24N: Check connection of "LO" and
"NO" on the outdoor noise filter circuit board.
Check connection of "R" and "S" on the
outdoor power circuit board.
A30–A42N: Check connection of "L1" and "L2"
on the active filter module. (ACTM)
Refer to "10-9. TEST POINT DIAGRAM".
circuit board.
b) Replace outdoor noise filter circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
are checked but the units cannot be repaired).