21
The unit does not operate with the remote controller.
Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.
Check of indoor P.C. board and indoor fan motor
C
Yes
No
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. Please replace the fuse after removing
the indoor terminal P.C. board from the electrical box.
Yes
No
Does the unit operate with the remote controller?
Does OPERATION INDICATOR lamp light up by
pressing EMERGENCY OPERATION switch?
Turn OFF the power supply.
Remove indoor fan motor connector CN211 from indoor
power P.C. board and vane motor connector CN151
from the indoor electronic control P.C. board and turn
ON the power supply.
Measure the resistance of the vane motor coil.
Refer to 10-5.
Measure the resistance
Refer to 10-5 of indoor fan motor.
Short circuit:
Replace the indoor fan motor.
Short circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor terminal P.C.
board visually.
Replace the varistor(NR11) and fuse(F11).
w
Are the varistor (NR11) burnt
and the fuse (F11) blown?
Be sure to check both the fuse
and the varistor in any case.
No
Yes
No
Is the fuse (F11) blown only?
Yes
No
Is the resistance normal?
Is the approx. 5VDC between 5V (+)
and JPG(GND) (–) of the indoor
electronic control P.C.board? Is there
approx. 9V to 13VDC between 12V (+)
and JPG (GND) (–) of the indoor
electronic control P.C. board.
Measure the resistance of
indoor fan motor.
Refer to 10-5.
Replace the fuse (F11).
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Replace the fuse (F11) and the indoor fan motor.
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Is the resistance
approx. 4
'
?
Measure the resistance of cement
resistor R111 on the indoor power
P.C. board.
Replace the indoor fan motor.
Yes
Connect the connector or repair
disconnection.
Yes
No
Are connector CN10A on
the indoor electronic control
P.C. board or lead wires
disconnected?
No
Replace the indoor power / terminal P.C. board.
Replace the indoor power / terminal P.C. board
and the indoor fan motor.
Yes
JPG (GND)
12VDC
5VDC
CN10A
CN211
Indoor power P.C.board
Indoor electronic
control P.C.board
Fuse (F11)
Indoor terminal
P.C.board
Varistor
(NR11)
R111
