Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 268

Resolución de averías
MSZ-HC35VA MSZ-HC35VAB
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
Turn OFF the power supply.
Is there any foreign matter that
interferes the rotation of the
line flow fan?
Yes
Remove the foreign matter and
adjust the line flow fan.
Is there 325V DC between
CN211 1 (+) and 3 (–) ?
No
Replace the indoor power / terminal
P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3times, and then stops.
Measure the voltage between CN211
6 (+) and 3 (–) while the fan
motor is rotating.
Replace the indoor
power / terminal P.C. board.
Indoor electronic
control P.C. board
268
Pay careful attention to the high voltage on
the fan motor connector CN211.
Turn ON the power supply, wait 5 seconds or more, then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds
after EMERGENCY OPERATION switch is pressed.
No
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the following voltage on the indoor
P.C. board.
<Indoor power P.C. board>
1.Measure the voltage between CN211 1 (+) and 3 (–).
2.Measure the voltage between CN211 5 (+) and 3 (–).
<Indoor electronic control P.C. board>
1.Measure the voltage between CN10A 6 (+) and JPG(GND)(–).
If more than 12 seconds or more passes after EMERGENCY OPERATION
switch is pressed, the voltage mentioned above 2 goes 0V DC although
the indoor P.C. board is normal.
Does the voltage between CN211
5 (+) and 3 (–) on the power
Yes
P.C. board rise to the range of 2V
to 6V DC within 12 seconds after
EMERGENCY OPERATION
switch is pressed?
Does the voltage between CN10A
6 (+) and JPG (GND)(–) on the
Yes
indoor electronic control P.C.
board fall to 2V or less within 12
seconds after EMERGENCY
OPERATION switch is pressed?
Is it unchanged holding
0V DC or 15V DC?
Replace the indoor fan motor.
Yes (Unchanged)
Is it unchanged holding
0V DC or 15V DC?
Indoor terminal
P.C.board
JPG (GND)
Fuse (F11)
CN10A
Yes Replace the
indoor fan motor.
No
Replace the indoor
No
electronic control
P.C. board.
Measure the voltage CN10A 2 (+) and
No
(Changed)
JPG (GND)(–) on the indoor electronic
control P.C board when the fan motor
is rotaring.
Yes
(Unchanged)
No (Changed)
Indoor power P.C.board
Varistor
(NR11)
Replace the indoor
electronic control
P.C. board.
CN211