Mitsubishi Electric MUX-A20WV Service Manual download pdf (Page 61)

Check of indoor/outdoor units’ connection and outdoor unit

Cool air does not blow out although indoor unit is operating.

Turn ON the power supply, and operate all the indoor

units at a time.

Yes

Operate the indoor unit one by one, and measure

the voltage between 1 and 2 of outdoor

terminal block for each indoor unit.

Match the signs of terminal block whose voltage is

12V DC and pipe of indoor/ outdoor units' connection.

w1.

Do they perform the cooling operation?

Start

Indoor

unit

Model

Terminal

block

Connector for

solenoid coil control

MUX-2A28VB

MUX-4A73VB

TB2

TB3

TB4

TB2

TB3

TB4

TB5

21R1

21R2

21R3-CN85

21R4-CN86

21R1-CN83

21R2-CN84

21R3-CN85

21R4-CN86

21R

21RB-CN81

21RA-CN82

21RB-CN81

w1. MUX-2A28/3A60/3A63/4A73VB

If the pipe of indoor unit that does not operate is cooled

though the combination of pipe and connecting wire is correct,

check the solenoid coil. Refer to 7.WIRING DIAGRAM.

Turn OFF the power supply.

Remove solenoid coil's connector that corresponds

to the indoor unit, which does not blow out cool air.

Then, measure the resistance of solenoid coil.

Do the resistance value normal?

(Refer to 11-3.)

Yes

Reconnect solenoid coil's connector.

Then turn the main power on and operate the

indoor unit that does not blow out cool air.

Measure the voltage of solenoid coil's connector that

corresponds to the indoor unit, which is operated.

Replace the solenoid coil.

Is voltage 230V?

Yes

Check wiring of outdoor

unit and relay. (Refer to page 16.)

MUX-3A60VB

MUX-3A63VB

Replace the outdoor

control P.C. board.

MUX-2A28VB

MUX-2A59/3A60/3A63/

2A70/4A73VB

w In case of troubleshooting, be sure to operate indoor unit by emergency operation switch.

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Mitsubishi Electric MUX-A20WV Service Manual Page 61

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