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.

1 Open the cover of the electrical box.

Unfasten the 4 hooks. The hooks are marked with.

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?

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.

Warning: The sound blanket is fragile. Handle with care.

Remove the sound blanket (top upper)

Pass the discharge pipe through the sound blanket

Remove the screw from the partition plate (1) and push the plate to the left slightly for easy work

Remove the sound blanket (outer)

Pass the discharge pipe through the sound blanket

Remove the sound blanket (top inner)

Pass the discharge pipe through the sound blanket

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Measure the resistance of each thermistor using tester

The relationship between normal temperature and resistance is shown in the table and the graph below

The room temperature thermistor is directly mounted on the display PCB. Remove the display PCB from the control PCB to measure the resistance.

When the indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor and measure the resistance.

Sign off on the thermistor resistance check