OB274-38
Check of indoor electronic control P.C. board
C
Check of outdoor unit
D
Compressor an
d / or outdoor fan doesn’t operate.(Only indoor fan operates.)
Check voltage to terminal block
of indoor unit.
Is there 12V DC between
2
-
1
?
Press EMERGENCY OPERATION switch.
3-minute time delay works.
Test run operation operates for 30 minutes.
Start
Check voltage to terminal block of outdoor unit.
Is there 12V DC between
2
-
1
?
Check the wiring, compressor contactor (52C),
outdoor fan motor and compressor.
Re-connect the continuity of
indoor and outdoor unit connec-
tion.
Replace the indoor electronic control P.C.
board.
No
Yes
The unit doesn’t operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
Check the both “parts side” and “pattern
side” of indoor electronic control P.C.
board visually.
Replace the fuse.
Is fuse(F11) blown?
Be sure to check both fuse
and varistor in any case.
Replace the fan motor.
Replace the
indoor electronic
control P.C. board.
Is winding resistance
of fan motor 0
"
?
Is winding resistance
of vane motor 0
"
?
No
Yes
Replace the vane motor.
No
Yes
Yes
Is varistor(NR11) burnt?
Replace the varistor.
Yes
Turn OFF the power supply.
Remove indoor fan motor connector CN211(MS09 only)
and vane motor connector CN151 from
the indoor electronic control P.C. board and turn ON the
power supply.
No
No
Does the unit operate with the remote controller or
the OPERATION INDICATOR lamp light up
by pressing the EMERGENCY OPERATION switch?
Yes
No
Be sure to check both resistances.
Turn OFF the
power supply.
Turn OFF the
power supply.
Yes
No
