Compressor and outdoor fan do not operate.
Check the outdoor power supply and connection.
No
Check of outdoor unit
D
Check the voltage of terminal block outdoor unit
AC220~240V between
L
-
N
.
Yes
Yes
Start
Reconfirmed
Check the indoor unit control P.C. board.
Refer to the service manual No.OB227 REVISED
EDITION-B page 121.
Check continuity of indoor and outdoor unit conec-
tion.
No
No
Check the voltage of terminal block of indoor
unit. Is there 12V DC to terminal block between
1
and
2
.
Yes
Is fuse F61 blown?
Yes
Check the voltage of terminal block of outdoor
unit. Is there 12V DC to terminal block between
1
and
2
.
Exchange the wiring whith continuity is no in.
Remove connector from outdoor control P.C. board CN71~CN74, CN90,
and continuity confirmation next (1) ~ (8).
(1) Between CN71
1
pin and
1
of A room of the outdoor terminal block.
(2) Between CN71
3
pin and
2
of B room of the outdoor terminal block.
(3) Between CN73
1
pin and
1
of B room of the outdoor terminal block.
(4) Between CN73
3
pin and
2
of B room of the outdoor terminal block.
(5) Between CN74
1
pin and
1
of C room of the outdoor terminal block.
(MUX20TV only)
(6) Between CN74
3
pin and
2
of C room of the outdoor terminal block.
(MUX20TV only)
(7) Between CN90
1
pin and
L
of the outdoor terminal block.
(8) Between CN90
3
pin and
N
of the outdoor terminal block.
Replace the fuse.
Turn OFF power supply to the indoor unit and the outdoor
unit.
Replace outdoor control P.C. board.
No
All continuity in the upper (1) ~ (8).
Yes
29
No
OB284-1.qxp 01.4.26 8:59 PM Page 29
