Daikin Outdoor Heat Pump RX60G3V1B

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

Continuity between the pins 1 - 6, 3 - 6, 2 - 5, 4 - 5 (between the pins 1 - 6, 2 - 6, 3 - 6, 4 - 6 for the harness 5P models)

If continuity is confirmed in step 3, the outdoor unit PCB is not faulty

Sign off on the electronic expansion valve check

Warning: Ensure the power is off before starting the procedure

Disconnect the connectors of the thermistors from the PCB

Measure the resistance of each thermistor using a multimeter

Remove the PCB from the control PCB to measure the resistance if the room temperature thermistor is soldered on a PCB

Remove the thermistor and measure the resistance if the connector of indoor heat exchanger thermistor is soldered on a PCB

Sign off on the thermistor resistance check

Check No.16: Make sure that the voltage of 320 is applied.

1. Set operation off and power off. Disconnect the connector S70.

2. Check that the voltage between the pins 4 - 7 is 320 VDC.

3. Check that the control voltage between the pins 3 - 4 is 15 VDC.

4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 6.5 VDC.

5. Keep operation off and power off. Connect the connector S70.

6. Check whether 4 pulses (0 ~ 15 VDC) are input at the pins 1 - 4 when the fan motor is rotated 1 turn by hand.

When the fuse is melted, check the outdoor fan motor for proper function.

If NG in step 2 → Defective PCB → Replace the outdoor unit PCB (main PCB).

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?

Warning: Do not let the terminals (U,V,W) touch each other. High voltage is applied.

Power transistor test operation activated from the outdoor unit?

Diagnose according to 6 LEDs lighting status.

Check the connection of connector

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

Check the motor control voltage (pins 4 - 3)

Check the rotation command voltage (pins 4 - 2)

Check the rotation pulse (pins 4 - 1)

Sign off on the Indoor Fan Motor Connector Output Check