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35
Check of indoor electronic control P.C. board
C
Trouble of the indoor electronic
control P.C. board.
Yes
No
No
Is varistor(NR11)burnt?
Yes
Is fuse(F11)blown?
Check of outdoor unit
D
Start
Replace the indoor elec-
tronic control P.C. board.
Replace the
indoor elec-
tronic control
P.C. board.
Check the outdoor fan motor
and compressor.
Check the continuity of indoor
and outdoor unit connection.
No
No
No
No
Yes
Yes
MUCF-C13UV-
MUCF-C18UV-
E1
E1
Start
Check voltage to terminal
block of indoor unit. Is there
230V AC to terminal block
between
3
-
N
?
Check voltage to terminal
block of indoor unit. Is
there 230V AC to terminal
block between
2
-
N
?
Check voltage to terminal
block of outdoor unit. Is
there 230V AC to terminal
block between
3
-
N
?
Check the outdoor wiring
and conductor relay.
Check the continuity of
indoor and outdoor unit
connection.
Yes
Yes
Yes
MUCF-C24UV-
E1
Check voltage to terminal
block of outdoor unit. Is there
230V AC to terminal block
between
2
-
N
?
Check voltage to terminal
block of outdoor unit. Is there
230V 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.
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.
Replace the varistor.
Check both “parts side” and
“pattern side” of indoor
electronic control P.C. board
visually.
Compressor and / or outdoor fan motor does not operate.
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