Daikin Outdoor Heat Pump RXL12QMVJU9A

Warning: This procedure requires trained personnel with PPE!

Install an inverter analyzer 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 analyzer without touching each other?

Activate the power transistor test operation from the outdoor unit

Center of TEMP button and OFF button on the remote controller pressed at the same time?

Warning: This check requires trained personnel with PPE!

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

Upload a photo of the measured waveform

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero-cross?

Sign off on the power supply waveform check

Fan motor wire breakdown/short circuit check

(1) Check the connector for connection.

(3) Check if each resistance at the phases U - V and V - W is within specified range in the table below.

(1) Check the connector for connection.

(2) Check the motor control voltage is generated (between the pins 2 - 3).

Warning: Disconnect the thermistor ASSY from the PCB before measuring

Enter the resistance value of the thermistor

Does the measured resistance match the listed value?

If the resistance does not match, replace the thermistor

To check the thermistor soldered on a PCB, disconnect the PCB from other parts

Enter the resistance value of the soldered thermistor

Does the measured resistance of the soldered thermistor match the listed value?

If the resistance does not match, replace the soldered thermistor

Sign off on the thermistor resistance check

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is about 0 V before proceeding

Enter the voltage between (+) and (-) of the diode bridge (DB1)

Is the voltage approximately 0 V?

If voltage is not approximately 0 V, stop the procedure and report the issue

Enter the resistance between the pins of the DB1

Is the resistance either infinity or less than 1 k(omega)?

If resistance is either infinity or less than 1 k(omega), a short circuit occurs on the main circuit

Sign off on the main circuit short check