Mitsubishi Mr.Slim MSZ-FE09NA Manuel de service télécharger pdf (Page 27)

9-6. TROUBLESHOOTING FLOW

A Check of indoor fan motor

The indoor fan motor error has occurred, and the indoor fan does not operate.

Turn OFF the power supply.

Is there any foreign matter that interferes

the rotation of the line ﬂ ow fan?

Yes

Remove the foreign matter and

adjust the line ﬂ ow fan.

Pay enough 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-

GENCY OPERATION switch is pressed.

If more than 12 seconds passes, turn OFF the power supply and turn it

ON again, then measure the voltage.

1. Measure the voltage between CN211

(+) and (–).

2. Measure the voltage between CN211 (+) and (–).

If more than 12 seconds passes after EMERGENCY OPERATION switch

is pressed, the voltage measured at 2. above goes 0 VDC although the

indoor P.C. board is normal.

Does the voltage between CN211

(+) and (–) on the indoor electronic

control P.C. board rise to the range

of 3 to 6 VDC within 12 seconds after

EMERGENCY OPERATION switch is

pressed?

Replace the indoor fan motor.

Yes

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.

Replace the indoor electronic control P.C.

board and the indoor terminal P.C. board.

Is it unchanged holding

0 or 15 VDC?

(Changed)

Yes

(Unchanged)

Replace the indoor fan motor.

Is there 294/325 VDC

between CN211

(+)

and (–) ?

Yes

Replace the indoor

electronic control P.C.

board.

Replace the indoor electronic control

P.C. board.

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Mitsubishi Mr.Slim MSZ-FE09NA Manuel de service Page 27

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