Daikin Indoor Unit Multi-Split Type Air Conditioner CTXG12QVJUW

Warning: This procedure requires trained personnel with PPE!

Main circuit checked for short circuit?

Ensure firm contact between the multimeter probes and the test points.

Sign off on the capacitor voltage check

EV connector correctly inserted in the PCB

All EVs generate a latching sound after power cycle

Continuity between pins 5 - 1, 5 - 2, 5 - 3, 5 - 4

Good coil generates a latching sound when mounted in the EV unit

Note: Latching sound varies depending on the valve type

Sign off on the electronic expansion valve 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 indoor 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 indoor fan motor.

If OK in both steps (1) and (2) -> Replace the PCB (control PCB).;

1. Check the connection of connector.

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

3. Check motor control voltage (pins 4 - 3).

4. Check rotation command voltage output (pins 4 - 2).

5. Check rotation pulse input (pins 4 - 1).

1. Check the connection of connector.

2. Check motor power supply voltage output (pins 5 - 8).

Warning: This procedure requires trained personnel with PPE!

If power is not turned off, stop the procedure and turn off the power

Is the charged voltage of the built-in smoothing electrolytic capacitor 10 VDC or below?

If the charged voltage is above 10 VDC, wait until it drops to 10 VDC or below

Are the terminals from the compressor removed?

Are the 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.

Is the power transistor test operation activated from the outdoor unit?