Vermont Casting MSZ-D30NA, MSZ-D36NA, MSY-D36NA Check of indoor fan motor, Troubleshooting Flow

9-6. TROUBLESHOOTING FLOW

OPERATION INDICATOR 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.

			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.
Is there any foreign matter that			Measure the supply voltage as follows within 12 seconds after EMER-
			GENCY OPERATION switch is pressed.
interferes 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 or more passes after EMERGENCY OPERATION
Remove the foreign matter and
adjust the line flow fan.			switch 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				Indoor electronic
voltage between CN211 (+) and
			Replace the indoor fan motor.	control P.C. board
(-) rise to the range of 3 to 6 VDC		Yes
within 12 seconds after EMERGEN-
CY OPERATION switch is pressed?
	No

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 (+) 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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