When POWER lamp flashes ON and OFF in every 0.5-second. Outdoor unit does not operate.

D How to check mis-wiring and serial signal error

Turn OFF the power supply.

 

 

 

Is there rated voltage of

No

 

 

Check the power

 

 

 

 

230V AC in the power

 

 

 

 

 

 

 

 

 

 

 

 

supply.

 

 

 

 

supply?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn ON the power supply.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is there 230V AC between

 

 

 

 

 

 

 

 

 

Check the wiring.

 

 

 

 

 

 

 

 

 

 

outdoor terminal block S1 and

 

 

 

 

 

 

 

 

 

 

 

 

 

S2?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Press EMERGENCY OPERATION switch.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Does the lefl lamp of OPERATION INDICATOR

 

 

 

 

 

 

 

lamp light up?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

<Confirmation of the power to the indoor unit>

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Is there any mis-wiring,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the self-check of the indoor unit displayed 6

No

poor contact, or wire

 

 

minutes after?

 

 

 

 

 

 

 

 

disconnection of the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

indoor/outdoor

 

 

 

 

 

 

 

 

 

 

 

 

Serial signal error display

 

 

Yes

 

 

 

 

connecting wire?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

The left lamp of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPERATION

 

 

 

 

 

 

 

 

 

 

 

 

 

INDICATOR lamp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

blinks quickly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

Make them sure.

Inverter P.C.board (Parts side)

LED

Blinking

 

 

Turn OFF the power supply.

 

 

Check once more if the indoor/outdoor

 

 

connecting wire is not mis-wiring.

B

 

Short-circuit outdoor terminal block S2 and

 

 

 

 

S3.

 

 

W1

 

 

 

 

Turn ON the power supply of the outdoor unit.

In 3 minutes after turning ON the power supply of the outdoor unit, does the LED on the inverter P.C. board repeat quick blinking "3.6-second-OFF and 0.8-second-ON"?

Be sure to check above in 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. When the inverter P.C. board is normal, LED also blinks 6 times after 3 minutes.

W1. Mis-wiring may damage indoor electronic control P.C. board during the operation.

Be sure to confirm the wiring is correct before the operation starts.

No

Replace the inverter

(Lighting)

P.C. board.

W2

W2 Be careful to the residual voltage of smoothing capacitor.

A

·Turn OFF inverter-controlled lighting equipment.

·Turn OFF the power supply and then turn ON again.

·Press EMERGENCYOPERATION switch.

Yes

Remove the short-circuit between

 

Is there any error of the

outdoor terminal block S2 and S3.

 

 

indoor/outdoor connecting wire,

Is there amplitude of 10 to 20V DC

 

 

such as the damage of the wire,

between outdoor terminal block S2

 

No intermediate connection, poor

and S3? <Confirmation of serial

signal>

 

contact to the terminal block?

 

 

 

 

No

 

 

 

 

Yes

 

 

 

 

 

Yes

Replace the indoor/outdoor connecting.

Is serial signal

No

error indicated

 

6 minutes later?

 

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

·Attach a filter

 

 

 

Is there any error of the

Is there 230V AC between outdoor

 

indoor/outdoor connecting wire,

terminal block S1 and S2?

 

such as the damage of the wire,

 

<Confirmation of power voltage>

No intermediate connection, poor

 

Yes

 

contact to the terminal block?

 

 

 

 

Yes

Replace the indoor/outdoor connecting.

Yes

B

on receiving section of the indoor unit.

Replace the indoor electronic control P.C. board.

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

As for outdoor unit MUZ type,refer to service manual OB379. As for outdoor unit MXZ type,refer to service manual OB377.

20

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Mitsubishi Electronics MSZ-GA35VA, MSZ-GA25VA, MSZ-GA22VA service manual How to check mis-wiring and serial signal error, Led

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