Mitsubishi Mr.Slim MSZ-FE09NA Manuel de service télécharger pdf (Page 31)

D How to check miswiring and serial signal error

Turn OFF inverter-controlled lighting

equipment.

Turn OFF the power supply and then

turn ON again.

Press EMERGENCY OPERATION

switch.

•

Is serial signal

error indicated 6

minutes later?

Yes

Reinstall

either the unit

or the light

away from

each other.

Attach a ﬁ lter

on remote

control receiv-

ing section

of the indoor

unit.

•

Turn OFF the power supply.

Is there rated voltage in the power supply?

Yes

Turn ON the power supply.

Check the power supply.

Is there rated voltage between outdoor terminal block S1 and S2?

Check the wiring.

Press EMERGENCY OPERATION switch once.

Does the OPERATION INDICATOR lamp light

up? <Conﬁ rmation of the power to the indoor

unit>

Yes

Is serial signal error indicated 6 minutes

later?

Yes

Is there any miswiring,

poor contact, or wire

disconnection of the

indoor/outdoor connect-

ing wire?

Yes

Correct them.

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Short-circuit outdoor terminal block S2

and S3.

1. Miswiring may damage indoor electronic control P.C.

board during the operation.

Be sure to conﬁ rm the wiring is correct before the opera-

tion starts.

Turn ON the power supply.

Does the LED on the inverter P.C. board or the outdoor electronic control P.C.

board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? 3

Yes

(Lighted

or not

lighted)

Replace the inverter P.C. board or the outdoor

electronic control P.C. board.

2. Be careful of the residual voltage of smoothing

capacitor.

Turn OFF the power supply.

Remove the short-circuit between outdoor terminal block S2 and S3.

Yes

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the

inverter P.C. board or the outdoor electronic control P.C.

board is normal, LED blinks 6 times after 3 minutes.

(Except for outdoor unit of multi system type)

Is the bus-bar voltage of the inverter P.C. board or the outdoor electronic control P.C. board normal? (Refer

to "TEST POINT DIAGRAM AND VOLTAGE" in the outdoor service manual.)

Yes

Replace the indoor electronic control P.C. board.

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Mitsubishi Mr.Slim MSZ-FE09NA Manuel de service Page 31

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