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.

18

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