Daikin Ducted‑Style Indoor Unit ATXS25G2V1B

Output voltage between pins 1 and 3

Generation of 3 pulses between pins 2 and 3 when the fan motor is operating

If NG in step 1 or 2, select the defective part

Warning: This procedure should be performed by a trained technician

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

Upload a photo of the measured waveform

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)?

Warning: This procedure requires trained personnel with PPE!

EV connector correctly inserted in the PCB

All EVs generate latching sound after power cycle

If any EV does not generate latching sound, proceed to next step

Continuity between pins 1 - 6 and 3 - 6

Continuity between pins 2 - 5 and 4 - 5

If no EV generates latching sound, the outdoor unit PCB is faulty

Good coil mounted in the EV unit generates latching sound

If latching sound is generated, the outdoor unit PCB is faulty

Check the connection of connector

Check motor power supply voltage output (pins 4 - 7)

Check motor control voltage (pins 4 - 3)

Check rotation command voltage output (pins 4 - 2)

Check rotation pulse input (pins 4 - 1)

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Thermistors disconnected from the PCB?

Enter the resistance of each thermistor

Select the model of the thermistor

For models directly mounted on the PCB, disconnect the connector for the PCB and measure

Connector for the PCB disconnected?

Enter the resistance of the thermistor

Sign off on the thermistor resistance check