Mitsubishi Electric MUX-A20WV Service Manual download pdf (Page 59)

Check of outdoor unit

Start

Press the EMERGENCY

OPERATION switch of all

indoor units.

Yes

Is there 230V AC

between L

- N

on the TB1

of outdoor unit?

Is fuse(F61) on the outdoor

control P.C. board broken?

Check and rectify the

connecting wire of

indoor and outdoor unit.

3 minutes later, is there

12V DC between

1 - 2 on the all terminal

blocks of outdoor unit?

Is there 10~15V DC between

JP20 DC12V and JP19 GND

on outdoor control P.C.

board?

Fan motor doesn't operate.

Compressor doesn't operate.

Yes

Turn OFF the power supply

to outdoor unit.

Does outdoor control P.C.

board connect with outdoor

fan capacitor C61?

Yes

Connect the outdoor control

P.C. board with outdoor fan

capacitor C61.

Disconnect connector of

outdoor fan motor CN91

and outdoor fan capacitor

C61.

Replace the outdoor

fan motor.

Replace the outdoor

control P.C. board.

Yes

Turn OFF the power supply.

Replace the outdoor

control P.C. board.

Disconnect connector of outdoor fan motor

CN91 and outdoor fan capacitor C61.

Is the resistance 0" or ∞ between the lead wire

WHT and BLK of outdoor fan motor, or between

the lead wire RED and BLK of outdoor fan motor?

(Refer to 11-3.)

Yes

Replace the outdoor

fan motor and fuse(F61).

Check the power supply

and connecting wire.

Is there 12V DC between

- 2

on the terminal

block of each indoor unit?

Short both terminal

of fuse(F61).

Yes

Is the resistance 0" between

the fuse(F61) and the terminal

of CN903?

Replace the outdoor

control P.C. board.

Yes

Replace

the fuse(F61).

Check the indoor unit.

Yes

Turn OFF the power supply to outdoor unit.

Disconnect connecting wire of X521 and X522 from outdoor control P.C. board.

Insulate terminal of connecting wires to prevent contact of other parts.

Turn ON the power supply to outdoor unit.

Press the EMERGENCY OPERATION switch of all indoor unit.

Is the resistance 0" or ∞

between the terminal C and

R of MC1, and between the

terminal C and S of MC1?

(Refer to 11-3.)

3 minutes later, is the resistance 0" between the

terminal 3 and 4 of X521 on outdoor control P.C. board,

and between the terminal 3 and 4 of X522 on outdoor

control P.C. board?

Turn OFF the power supply

to outdoor unit.

Yes

Replace the

compressor MC1.

Replace the

compressor MC2.

Check and

rectify the

connecting wire

of terminal and

compressor.

Turn OFF the power supply

to outdoor unit.

Replace the outdoor

control P.C. board.

Is the resistance 0" or ∞

between the terminal C and

R of MC2, and between the

terminal C and S of MC2?

(Refer to 11-3.)

Yes

Is the resistance 0" or ∞

between the lead wire

WHT and BLK of outdoor

fan motor, or between the

lead wire RED and BLK

of outdoor fan motor?

(Refer to 11-3.)

Measure resistance on

all the solenoid coils.

Is resistance 0"?

Replace the solenoid coil.

Yes

2A59/2A70VB

MUX-3A60/3A63/

4A73VB

Compressor and / or outdoor fan doesn’t operate.

11-4.Troubleshooting flow

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Mitsubishi Electric MUX-A20WV Service Manual Page 59

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