Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 318

Resolución de averías
The unit cannot be operated with the remote controller.
Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.
Check of indoor electronic control P.C. board and indoor fan motor
C
Turn OFF the power supply.
Remove indoor fan motor connector CN211/ CN212 and
vane motor connector CN151/ CN152 from the indoor
electronic control P.C. board and turn ON the power
supply.
Does the unit operate with the remote controller?
Does OPERATION INDICATOR lamp light up by
pressing EMERGENCY OPERATION switch?
No
Turn OFF the power supply.
Check both "parts side" and "pattern
side" of the indoor electronic control P.C.
board visually.
Indoor electronic
control P.C. Board
Fuse (F11)
VARISTOR (NR11)
C111 T11
R111
318
Turn OFF the power supply.
Measure the resistance between
3 and 4 of the indoor fan motor
CN212
connector.
Yes
Turn OFF the power supply.
Measure the resistance of the horizontal vane
motor coil.
Refer to 10-5.
Replace the varistor(NR11) and fuse(F11).
Are the varistor(NR11) burnt
and the fuse(F11) blown?
Be sure to check both the fuse
and the varistor in any case.
Is the fuse(F11) blown only?
Measure the resistance between
1 (+) and 3 (-) of the indoor fan
motor connector (to CN211 / CN212
on the indoor electronic control
P.C. board).
Is the resistance 1M
or more?
Replace the fuse (F11).
Measure the cement resistance R111 on
the indoor electronic control P.C. board.
JR06
JR05
IC101
CN1X1 CN1Y1
CN151
CN152
CN211
CN212
CN211/
Yes
No
No
Yes
1. The fan motor connector's 1 lead wire is red, whereas 3 is black.
2. Connect "+" of the tester to fan motor connector's 1 lead
wire, and "-" to 3 lead wire, otherwise the resistance cannot be
1, 2
measured properly.
No
Replace the fuse (F11) and the indoor fan motor.
Yes
Is the resistance
approx. 4 ?
Yes
Replace the indoor electronic control P.C. board.
Short/ open circuit:
Replace the indoor fan motor.
Short/ open circuit:
Replace the horizontal vane motor and the indoor
electronic control P.C. board.
No
Replace the indoor electronic control P.C. board
and the indoor fan motor.