Daikin Air Conditioner RX30NMVJUA

Voltage applied (320 + 100 V ~ 320 - 50 V)

Set operation off and power off. Disconnect the connector S70 or S71

Voltage between the pins 4 - 7 (320 VDC)

Control voltage between the pins 4 - 3 (15 VDC)

Rotation command voltage between the pins 4 - 2 (0 ~ 6.5 VDC)

Keep operation off and power off. Connect the connector S70 or S71

Rotation pulses (0 ~ 15 VDC) at the pins 4 - 1 when the fan motor is rotated 1 turn by hand

Sign off on the rotation pulse check

Conduct the following to check the electronic expansion valve (EV)

Check if the EV connector is correctly connected to the PCB

Turn the power off and on again, and check to see if the EV generates a latching sound

If the EV does not generate a latching sound in the above step 2, disconnect the connector and check the continuity using a multimeter

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

If the continuity is confirmed in step 3, the outdoor unit PCB (main PCB) is faulty;

Check the connection of connector

Check the motor power supply voltage output

Check the motor control voltage

Check the rotation command voltage

Sign off on the connector output check

Warning: This procedure requires trained personnel with PPE!

Main circuit checked for short circuit?

Warning: Never touch any live parts during the procedure.

Note: The surface of the test points (DC–) may be covered with the coating.

Firm contact between the multimeter probes and the test points?

Sign off on the capacitor voltage check

Warning: This check requires trained personnel with PPE!

Measure the power supply waveform between No. 1 and No. 2 on the terminal board

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero-cross?

Upload a photo of the measured waveform

Sign off on the power supply waveforms check