Daikin Air Conditioner RX36NMVJUA

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?

Sign off on the power supply waveforms check

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

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;

Warning: This procedure requires trained personnel with PPE!

If power is not turned off, stop the procedure and turn off the power

Inverter analyzer installed instead of compressor?

Ensure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC or below before proceeding

Enter the charged voltage of the built-in smoothing electrolytic capacitor

Power transistor test operation activated from the indoor unit?

Sign off on the inverter analyzer check

Warning: Ensure the voltage between (+) and (–) of the power module is approximately 0 V before proceeding

Disconnect the compressor harness connector from the outdoor unit PCB

Compressor harness connector disconnected successfully?

Press the protrusion on the connector to disengage it

Connector disengaged successfully?

Measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter

Sign off on the power module check