Daikin Outdoor Unit for Multi-Split System 4MXS32GVJU

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Did you wait for 10 minutes after turning off all power supplies?

1.1 Unfasten the 2 hooks at the bottom first.

1.2 Slide the suction grille downward to unfasten the 3 top hooks.

2.1 Remove the 4 screws on the back and the screw on the left side.

2.2 Remove the 2 screws on the front and the screw on the right side panel.

Disconnect the compressor lead wires. U : red, V : yellow, W : blue

Disconnect the pipings, referring to page 221

Sign off on the compressor removal

Conduct the followings to check the outdoor electronic expansion valve (EV).

1. Check to see if the EV connector is correctly inserted in the PCB. Match the EV unit number and the connector number.

2. Turn the power off and on again, and check to see if all the EVs generate latching sound.

3. If any of the EVs does not generate latching sound in the above step 2, disconnect that connector and check the continuity using a tester.

Check the continuity between the pins 1 - 6 and 3 - 6, and between the pins 2 - 5 and 4 - 5. If there is no continuity between the pins, the EV coil is faulty.

4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty.

5. If the continuity is confirmed in the above step 3, mount a good coil (which generated latching sound) in the EV unit that did not generate latching sound, and check to see if that EV generates latching sound.

If latching sound is generated, the outdoor unit PCB is faulty.

If latching sound is not generated, the EV unit is faulty.

Warning: This procedure requires trained personnel with PPE!

Install the inverter checker instead of a compressor

Charged voltage of the built-in smoothing electrolytic capacitor dropped to 10 VDC or below?

Terminals removed from the compressor?

Terminals connected to the terminals of the inverter checker without touching each other?

Activate the power transistor test operation from the outdoor unit

Forced operation [ON/OFF] switch pressed for 5 seconds?

Diagnose according to 6 LEDs lighting status

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Did you wait for 10 minutes after turning off all power supplies?

Remove the 2 lower screws of the fan motor.

Remove the 2 upper screws. Be sure to remove the lower screws first. If the upper screws are removed first, the fan motor may tilt or fall because the center of its gravity is toward the front. It may cause injuries.

When reassembling, be sure to place the wire harness lower.

Sign off on the fan motor removal