Daikin Outdoor Unit Heat Pump For Split System RXS25K3V1B

Warning: This check requires trained personnel with PPE!

Upload a photo of the power supply waveform between No. 1 and No. 2 on the terminal board

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero-cross?

Sign off on the power supply waveforms check

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

If there is no continuity between the pins, the EV coil is faulty

If the continuity is confirmed, the outdoor unit PCB is faulty

Sign off on the electronic expansion valve check

RK(X)S25/35E2V1B, RK(X)S25/35G2V1B, RXS25/35L3V1B Procedure

Control voltage between the pins 3 - 4

Rotation command voltage between the pins 2 - 4

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

RK(X)S25/35G2V1B9, RXS25/35J2V1B, RXS25K3V1B, RXS35K2V1B, RXS25/35L2V1B Procedure

Voltage between the pins 10 - 11

Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 - 12, 10 - 13, when the fan motor is manually rotated once

Sign off on the rotation pulse check

1. Check the connector connection.

2. With the power on, operation off, and the connector connected, check the following.

(1) Output voltage of about 5 V between pins 1 and 3.

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

If NG in step (1) => Defective PCB => Replace the PCB (control PCB).

If NG in step (2) => Defective Hall IC => Replace the fan motor.

If OK in both steps (1) and (2) => Replace the PCB (control 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 without touching each other?

Activate the power transistor test operation from the outdoor unit

Pressed the forced cooling operation ON/OFF button for 5 seconds?

Activate power transistor test operation from indoor unit