26
OCH721A
10-4. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Note: Refer to indoor unit section for code P and code E.
Check code Abnormal points and detection method
Cause
judgment and action
None
—
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
Disconnection of connector LI
or NI
3
Electric power is not supplied to
outdoor controller circuit board.
a) Disconnection of connector
(CNDC)
4
Disconnection of reactor (DCL)
6
Defective outdoor power circuit
board
7
Defective outdoor controller
circuit board
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
Disconnection of connector LI or NI
Refer to "10-9. TEST POINT DIAGRAM".
3
Check
connection of the connector (CNDC)
on the outdoor controller circuit board.
Check
connection of the connector CNDC on
the outdoor power circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
4
Check
connection of reactor. (DCL)
Check connection of "TB1A", "TB3A", "TB1B"
and "TB3B" on the outdoor power circuit board.
Refer to "10-9. TEST POINT DIAGRAM".
6
Replace outdoor power circuit board.
7
Replace controller board (When items above
are checked but the units cannot be repaired).
