Daikin Outdoor Unit Multi-Split Type Air Conditioner 4MXS36RMVJU

Make sure that the voltage of 320 V is applied.

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

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

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

Check that the rotation command voltage between the pins 4 - 2 is 0 ~ 15 VDC.

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

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

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

Warning: Check the main circuit for short circuit before proceeding

Warning: Never touch any live parts during the procedure

Voltage between FU2 and DC– is 50 V or less

Note: Ensure firm contact between the multimeter probes and the test points

Sign off on the capacitor voltage check

CTXG, FTXR, CTXS, FTXS, FVXS Series

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).

2. With the fan motor connector disconnected, measure the resistance between each pin, then make sure that the resistance is more than the value mentioned in the following table.

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

Output voltage of about 5 V between pins 1 and 3

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)

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

Thermistors disconnected from the PCB?

Measure the resistance of each thermistor using a multimeter

Note: The data is for reference purpose only

Is the room temperature thermistor soldered on a PCB?

If yes, remove the PCB from the control PCB to measure the resistance

Is the connector of indoor heat exchanger thermistor soldered on a PCB?

If yes, remove the thermistor and measure the resistance

Sign off on the thermistor resistance check