Daikin Outdoor Unit Air Conditioner RZR30PVJU

Warning: Do not touch the energized part (high voltage part) for at least 10 minutes after the power is turned OFF.

Be sure to touch the ground terminal with a hand to release static electricity from the body (to prevent PCB from being damaged).

Measurements at the following spots and confirm that residual electric charge of the power transistor is DC 50V or less.

Confirm that the outdoor unit fan has stopped

Remove the connector of the outdoor unit fan motor.

Remove the wire connecting the power transistor and the compressor. Remove it from the compressor terminal side.

During this work, be careful not to deform Faston terminal at the end of the relay wire.

Using an analog tester, measure resistance and fill in the blanks in the following table.

In case of unbalanced resistance for one of the 3 phases in each table (when the resistance value is equal to 5 times or more than the other resistance values), the power transistor is broken.

Warning: This procedure requires trained personnel with PPE!

If power supply is not turned OFF, stop the procedure and turn OFF the power supply

Resistance between phases of U, V, W at the motor side connectors balanced?

Note: Check on connector of fan motor is not available for below models. FCQ18~42PAVJU, FAQ18 · 24PVJU

Sign off on the fan motor connector check

If the cause of the problem is related to the thermistors, then the thermistors should be checked prior to changing the PCB.

For more information about these thermistors, see:

The table below contains an overview of the thermistors:

To check the thermistors, proceed as follows:

1. Disconnect the thermistor from the PCB