Service manual

39
Check of indoor electronic control P.C. board
C
The unit doesn’t operate with the
remote controller.
Also, the Operation indicator lamp
doesn’t light up by pressing the
EMERGENCY OPERATION switch.
Replace the fuse.
Trouble of the indoor electronic
control P.C. board.
Replace the varistor.
Yes
No
Check both “parts side”and “pattern
side” of indoor electronic control P.C.
board visually.
No
Is varistor(NR11)burnt?
Yes
Is fuse(F11)blown?
Check of outdoor unit
D
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
Start
Replace the indoor elec-
tronic control P.C. board.
Replace the
indoor elec-
tronic control
P.C. board.
Check the outdoor wiring the
outdoor fan motor and com-
pressor.
Check the continuity of indoor
and outdoor unit connection.
No
No
No
No
Yes
Yes
MCF-13NV-
MCF-18NV-
E3
E4
Start
Check voltage to terminal
block of indoor unit. Is there
220-240V AC to terminal
block between 3 - N ?
Check voltage to terminal
block of indoor unit. Is
there 220-240V AC to ter-
minal block between 2 - N
Check voltage to terminal
block of outdoor unit. Is
there 220-240V AC to termi-
nal block between 3 - N ?
Check the outdoor wiring
and conductor relay.
Check the continuity of
indoor and outdoor unit
connection.
Yes
Yes
Yes
MCF-24NV-
E3
Check voltage to terminal
block of outdoor unit. Is there
220-240V AC to terminal
block between 2 - N ?
Check voltage to terminal
block of outdoor unit. Is there
220-240V AC to terminal
block between 2 - N ?
No
Be sure to check both fuse
and varistor in any case.
Check the continuity of indoor
and outdoor unit connection.
Press EMERGENCY OPERATION
switch. 3-minute time delay works.
Test run operation operates for 30
minutes.
Press EMERGENCY OPERATION
switch. 3-minute time delay works.
Test run operation operates for 30
minutes.
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