Daikin Outdoor Heat Pump RXL09QMVJUA

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

Outdoor unit PCB (main PCB) is not faulty

Sign off on the electronic expansion valve check

Voltage between (+) and (–) of the diode bridge (DB1)

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

Resistance between the pins of the DB1

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

Sign off on the main circuit short check

Warning: Disconnect the connector of thermistor ASSY from the PCB before proceeding

Enter the resistance value measured from the thermistor

Does the measured resistance value match the listed value?

If the measured resistance value does not match the listed value, the thermistor must be replaced.

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

Enter the resistance value measured from the soldered thermistor

Does the measured resistance value match the listed value?

If the measured resistance value does not match the listed value, the thermistor must be replaced.

Sign off on the thermistor resistance check

Warning: Ensure the operation is off and power is off before starting the procedure

Disconnect the connector S70 or S71

Control voltage between the pins 4 - 3

Rotation command voltage between the pins 4 - 2

Connect the connector S70 or S71

4 rotation pulses (0 ~ 15 VDC) at the pins 4 - 1 when the fan motor is rotated 1 turn by hand

Check the outdoor fan motor for proper function if the fuse is melted

If NG in step 2 or 4, select the defective part

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

Power transistor test operation activated?