Daikin Heat Pump Outdoor Unit RXS15LVJU

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

1 Disconnect the connector [S12] and pull out the clamp.

[S12]: for [HL4] [HN4] on filter PCB

2 Disconnect the connector [S10].

The compressor harness has a clamp.

When reassembling, insert the clamp as below.

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

Remove the screw and remove the four-way valve coil.

Warning: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.

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

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Restore the piping by nonoxidation brazing.

It is required to prevent the carbonization of the oil inside the four-way valve and the deterioration of the gaskets affected by heat. (Keep below 120°C (248°F).) For the sake of this, wrap the four-way valve with wet cloth and provide water so that the cloth does not dry.

Never use a metal saw to cut pipes because the sawdust may enter the circuit.

When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes may get deformed.

Warning: This check requires trained personnel with PPE!

EV connector correctly connected to the PCB

Did the EV generate a latching sound after power cycle?

Continuity confirmed using a tester after disconnecting the connector

Check the continuity between the pins

EV coil faulty if no continuity between the pins

Outdoor unit PCB faulty if continuity confirmed in step 3

Note: The latching sound varies depending on the valve type.

Sign off on the electronic expansion valve check

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

Thermistors disconnected from the PCB

Measure the resistance of each thermistor

Note: The relationship between normal temperature and resistance is shown in the table and the graph below

Display PCB removed from the control PCB

Measure the resistance of the room temperature thermistor

Indoor heat exchanger thermistor removed from the PCB

Measure the resistance of the indoor heat exchanger thermistor

Sign off on the thermistor resistance check

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.