Mitsubishi Electric MSZ-FH50VE - E1 Service Manual download pdf (Page 31)

MUZ-FH50

Turn the power supply OFF.

Is there rated voltage in the power supply?

Yes

Check for incorrect indoor-outdoor connecting wiring.

Check the power supply.

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

Check for miswiring, broken wires, and loose wire

connection between the power supply and outdoor

terminal block S1 and between the power supply and

outdoor terminal block S2.

Wait for 2 or more minutes after the power supply is turned on.

Touch S2 and S3 with tester probes and start the emergency operation.

When the emergency operation starts, does the rated voltage occur for 2 sec-

onds between indoor terminal block S2 and S3?

Was the indoor unit ever connected to the Multi

(MXZ) series and operated (turned on)?

The connection information to the Multi series is

stored in the indoor unit. Refer to “Deleting the

memorized abnormal condition” described in 10-2.1

to clear the error history. When the error history is

being cleared, the connection information also will

be initialized. The indoor unit will be compatible with

a low-standby-power model after initialization.

Yes

B Turn the power supply ON.

Yes

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

receiving section of the indoor unit.

•

NOTE: Refer to the outdoor unit service manual.

Replace the indoor electronic

control P.C. board.

Does the indoor POWER lamp

blink continuously 6 minutes after

the emergency operation starts?

Does DC (10 V or more) occur

between L68A and L68B on the

relay P.C. board?

Yes

Does the outdoor LED blink 6

times?

Yes

Replace the relay P.C. board. 1

Does DC (more than 0 V) occur

between indoor terminal block S2

and S3?

Yes

Replace the inverter P.C. board.

Turn the power supply OFF.

Start the emergency operation.

Repair has been completed.

Replace the inverter P.C. board

and the relay P.C. board. 1

Electric charge may remain immediately

after the power supply is turned OFF.

Perform the procedure after 3 minutes.

Replace the inverter P.C. board

and the relay P.C. board. 1

Turn the power supply ON.

Does the indoor POWER lamp

blink continuously 6 minutes after

the emergency operation starts?

Yes

Replace the indoor electronic

control P.C. board.

Yes

Replace the inverter P.C. board

and the relay P.C. board. 1

Yes

OBH623A

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Mitsubishi Electric MSZ-FH50VE - E1 Service Manual Page 31

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