Mitsubishi Electronics MSZ-FA35VA, MSZ-FA25VA Check of indoor fan motor, Troubleshooting flow

9-6. Troubleshooting flow

When POWER lamp flashes 3-time.

Indoor fan does not operate.

A Check of indoor fan motor

The indoor fan motor error has occurred, and the indoor fan doesn't operate.

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.

Is there any foreign matter that interferes the rotation of the line flow fan?

Yes

Adjust the line flow fan and remove the foreign matter.

No

Pay careful attention to the high voltage on the fan motor connector CN211.

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(-).

wIf 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.

Is there 311V DC between
CN211 1 (+) and 3 (-), and does
the voltage between CN211 5(+)		Yes
and 3(-) rise to the range of 3 to 6V			Replace the indoor fan motor.
DC within 12 seconds after
EMERGENCY OPERATION switch
is pressed?
	No

Indoor electronic control P.C. board

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" 3 times, and then stops.

Measure the voltage between CN211	Is it unchanged holding	Changed
			Replace the indoor electronic control P.C. board.
6(+) and 3(-) while the fan	0V DC or 15V DC?
motor is rotating.

Unchanged

Replace the indoor fan motor.

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