Daikin Outdoor Heat Pump RXN15KEVJU

EV connector correctly connected to the PCB

EV generates latching sound when power is turned off and on

Continuity confirmed when connector is disconnected and checked with a tester

Check the continuity between the pins

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

If continuity is confirmed, the outdoor unit PCB is faulty

Note: The latching sound varies depending on the valve type

1. Check the connection of connector.

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

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

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

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

Fan motor wire breakdown / short circuit check

1. Check the connector for connection.

Warning: Ensure the voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V before checking.

Enter the resistance between the pins of the DB1

Is the resistance 'infinity' or less than 1 kW?

Does a short circuit occur on the main circuit?

Sign off on the main circuit short check

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

Disconnect the refrigerant piping.

Preparation: Remove the electrical box according to the “Removal of Electrical Box / PCBs / Swing Motors”.

Caution: If the refrigerant leaks, repair the spot of leaking, then collect all refrigerant from the unit. After conducting vacuum drying, recharge proper amount of refrigerant.

Caution: In pump-down work, be sure to stop the compressor before disconnecting the refrigerant pipe. If the refrigerant pipe is disconnected with the compressor operating and the stop valve open, air may be sucked in and may generate an over-pressure in refrigeration cycle, thus resulting in pipe rupture or accidental injury.

Place a plastic sheet under the drain pan to prevent from wetting the floor with remaining drain.

If the drain hose is embedded in the wall, disconnect the drain hose beforehand.

Carry out the removal works with 2 wrenches.

When the pipings are disconnected, protect both the openings of pipe and unit from entering of moisture.

Warning: This procedure requires trained personnel with PPE!

Installed the inverter checker instead of a compressor?

Note: Make sure the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC or below before carrying out the service work.

Removed the terminals from the compressor?

Connected the terminals to the terminals of the inverter checker?

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

Selected FAN operation with the [MODE] button on the remote controller?