Daikin Indoor Unit Wall Mounted Type FTX09NMVJUA

EV connector correctly connected to the PCB

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

Continuity confirmed when connector is disconnected and checked with a multimeter

Check the continuity between the pins

EV coil is not faulty if there is continuity between the pins

Outdoor unit PCB (main PCB) is faulty if continuity is confirmed

Sign off on the electronic expansion valve check

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

Sign off on the thermistor resistance check

Warning: This check requires trained personnel with PPE!

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

Is the power supply waveform a sine wave (Refer to Fig.1)?

Is there waveform disturbance near the zero-cross (Refer to sections circled in Fig.2)?

Upload a photo of the measured waveform

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: 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?