Daikin Indoor Unit Wall Mounted Type Air Conditioner FTX18WVJU9

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

EV connector correctly connected to the PCB

EV generates a latching sound when power is turned off and on

Continuity confirmed when connector is disconnected and checked with a multimeter

Check the continuity between the pins

Outdoor unit PCB (main PCB) is not faulty

Sign off on the electronic expansion valve check

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: 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 kΩ?

If resistance is not infinity or less than 1 kΩ, a short circuit occurs on the main circuit

Sign off on the main circuit short check

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

Enter the voltage reading between (+) and (–) of the power module

Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

Was the compressor harness connector successfully disconnected?

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

Enter the resistance reading between the terminals of the power module and the terminals of the compressor

Evaluate the measurement results

Sign off on the power module check