MITSUBISHI ELECTRIC Mitsubishi Split-Type - Manual (Page 17)

17
Check of indoor fan motor A
When OPERATION INDICATOR lamp flashes 3-time.
Indoor fan does not operate.
w If 12 seconds or more passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0V DC although the
indoor electric control P.C. board is normal.
Indoor electronic
control P.C. board
Pay careful attention to the high voltage on
the fan motor connector CN211.
Yes
No
No
Changed
Unchanged
Is there any foreign matter that
interferes the rotation of the
line flow fan?
Turn OFF the power supply.
Insert a stick such as a screw driver
into the air outlet, and check if there is
any catch in the rotation of the line
flow fan.
Adjust the line flow fan and
remove the foreign matter.
w
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds
after EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage.
1.Measure the voltage between CN211
1 (+) and 3 (-).
2.Measure the voltage between CN211 5 (+) and 3 (-).
Is there 311V DC between
CN211
1 (+) and 3 (-), and does
the voltage between CN211 5 (+)
and 3 (-) rise to the range of 3 to 6V
DC within 12 seconds after
EMERGENCY OPERATION switch
is pressed?
Yes
Replace the indoor fan motor.
CN211
Replace the indoor electronic control 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.
Is it unchanged holding
0V DC or 15V DC?
Replace the indoor fan motor.
Replace the indoor electronic control P.C. board.
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
9-6. Troubleshooting flow
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