Logitech OB450 REVISED EDITION-B, MSZ-A09NA A Check of indoor fan motor, Troubleshooting Flow

8-6. TROUBLESHOOTING FLOW

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.

			Pay careful attention to the high voltage on the fan motor connector CN211.
			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 EMER-
Is there any foreign matter that interferes			GENCY OPERATION switch is pressed.
the rotation of the line flow fan?		No	If more than 12 seconds passes by, turn OFF the power supply and
			turn ON it again, then measure the voltage.
	Yes		1. Measure the voltage between CN211	(+) and	(-).
			2. Measure the voltage between CN211	(+) and	(-).
			If more than 12 seconds passes after EMERGENCY OPERATION switch
Remove the foreign matter and
adjust the line flow fan.			is pressed, the voltage mentioned above 2 goes 0 VDC although the
			indoor electronic control P.C. board is normal

Is there 294/325 VDC between
CN211 (+) and (-), and does the
voltage between CN211 (+) and (-)			Replace the indoor fan motor.
rise to the range of 3 to 6 VDC within		Yes
12 seconds after EMERGENCY
OPERATION switch is pressed?
	No

CN211

Indoor electronic control P.C. board

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 (+) and (-) while the fan motor is rotating.

Is it unchanged holding

0 or 15 VDC?No (Changed)

Yes

(Unchanged)

Replace the indoor fan motor.

Replace the indoor electronic control P.C. board.

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