Daikin Air Conditioner RX36NMVJU

Conduct the following to check the electronic expansion valve (EV)

Check if the EV connector is correctly connected to the PCB

Turn the power off and on again, and check to see if the EV generates a latching sound

If the EV does not generate a latching sound in the above step 2, disconnect the connector and check the continuity using a multimeter

Check the continuity between the pins 5 - 1, 5 - 2, 5 - 3, 5 - 4. If there is no continuity between the pins, the EV coil is faulty

If the continuity is confirmed in step 3, the outdoor unit PCB (main PCB) is faulty;

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is approximately 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 less than 1 kOhm?

If resistance is less than 1 kOhm, a short circuit occurs on the main circuit

Sign off on the main circuit short check

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

Thermistors disconnected from the PCB

Note: The room temperature thermistor is soldered on the PCB

Connector to the control PCB disconnected

If the connector of indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor

Indoor heat exchanger thermistor removed

Resistance of the indoor heat exchanger thermistor

Sign off on the thermistor resistance check

Voltage applied (320 + 100 V ~ 320 - 50 V)

Set operation off and power off. Disconnect the connector S70 or S71

Voltage between the pins 4 - 7 (320 VDC)

Control voltage between the pins 4 - 3 (15 VDC)

Rotation command voltage between the pins 4 - 2 (0 ~ 6.5 VDC)

Keep operation off and power off. Connect the connector S70 or S71

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

Check if 4 rotation pulses are input

Sign off on the rotation pulse check

Check the connection of connector

Check the motor power supply voltage output

Check the motor control voltage

Check the rotation command voltage

Sign off on the connector output check