D How to check miswiring and serial signal error

Turn OFF the power supply.

 

 

 

 

 

 

 

 

Is there rated voltage in the

 

 

 

 

 

Check the power supply.

power supply?

No

 

 

 

Yes

Turn ON the power supply.

Is there rated voltage between outdoor terminal block S1 and

S2?No

Yes

Press EMERGENCY OPERATION switch once.

Does AREA-L lamp light up? <Confirmation of the power to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Check the wiring.

No

Is there any miswiring, poor contact, or wire

No disconnection of the Yes Correct them. indoor/outdoor connect-

ing wire?

No

A

Turn OFF the power supply.

Check once more if the indoor/outdoor B connecting wire is not miswiring.

Short-circuit outdoor terminal block S2 and S3. 1

Turn ON the power supply.

1. Miswiring may damage indoor electronic control P.C. board during the operation.

Be sure to confirm the wiring is correct before the opera- tion starts.

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)

A

• Turn OFF inverter-controlled lighting

equipment.

• Turn OFF the power supply and then

turn ON again.

• Press EMERGENCY OPERATION

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

Turn OFF the power supply.

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

Turn ON the power supply.

Is there amplitude of 10 to 20 VDC between outdoor terminal block S2 and S3? <Confirmation of serial signal>

Yes

 

 

 

 

 

Replace the inverter P.C. board or the

 

 

 

 

 

 

outdoor electronic control P.C. board.

 

 

No

 

 

 

 

2

 

 

 

 

 

 

(Lighted

 

 

 

 

 

 

 

or not

 

 

2. Be careful to the residual

 

 

 

 

lighted)

 

voltage of smoothing capacitor.

 

 

 

Is there any error of the in-

 

 

 

 

 

 

door/outdoor connecting wire,

 

 

 

 

 

 

 

Replace the indoor/out-

 

 

 

such as the damage of the

 

No

 

wire, intermediate connection,

Yes

 

door connecting wire.

 

 

 

poor contact to the terminal

 

 

 

 

 

 

block?

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

switch.

Is there rated voltage between

Is there any error of the in-

door/outdoor connecting wire,

Is serial signal error indicated 6 minutes later?

Yes

B

No

•Reinstall either the unit or the light each other away.

•Attach a filter on remote control receiv- ing section of the indoor unit.

indoor terminal block S1 and S2?

No

such as the damage of the wire,

 

 

Replace the indoor/out-

Yes

 

door connecting wire.

<Confirmation of power voltage>

 

intermediate connection, poor

 

 

 

 

Yes

 

contact to the terminal block?

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace the indoor electronic control P.C. board.

Be sure to release the failure-mode recall function after checking.

32

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Mitsubishi Electronics MSZ-FD09NA service manual How to check miswiring and serial signal error
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MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

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