Daikin Heat Pump Outdoor Unit RXS18LVJU

Warning: This procedure requires trained personnel with PPE!

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

Inverter checker installed instead of a compressor?

Ensure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC or below before carrying out the service work

Terminals removed from the compressor?

Terminals connected to the terminals of the inverter checker?

Be careful not to let the terminals (U,V,W) touch each other. Otherwise, high voltage is applied

Power transistor test operation activated from the outdoor unit?

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

Voltage of 320 ± 30 V is applied

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

Control voltage between the pins 3 - 4

Rotation command voltage between the pins 2 - 4

1. When the timer cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen.

2. Press the timer cancel button repeatedly until a long beep sounds.

The code indication changes in the sequence shown below.

Note: 1. A short beep or two consecutive beeps indicate non-corresponding codes.

2. To return to the normal mode, hold the timer cancel button down for 5 seconds. When the remote controller is left untouched for 60 seconds, it also returns to the normal mode.

3. Not all the error codes are displayed. When you cannot find the error code, try the check method 2. (Refer to page 92.)

Check Method 2 1. Press the 3 buttons (TEMP, TEMP, MODE) at the same time to enter the diagnosis mode.

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Disconnect the lead wires of the compressor.

Warning: Use caution to avoid burning yourself with pipes and other parts that are heated by the gas brazing

Warning: If the refrigerant gas leaks during work, immediately ventilate the room. If refrigerant gas is exposed to flames, toxic gas may be generated.

Warning: If the refrigerant oil in the compressor catches fire, have a wet cloth prepared to extinguish the fire immediately.

Caution: For global environmental protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Remove the 2 nuts of the compressor.

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Remove the 2 screws of the protection plate.

Remove the screws and remove the connecting wires and the power supply wires.

Remove the 2 screws of the conduit mounting plate.

Remove the conduit mounting plate.

Remove the 2 screws and remove the ground wire.

Pull out the outdoor temperature thermistor.

Remove the 4 screws of the right side panel.