Daikin Outdoor Heat Pump RXS42G2V1B

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 ∞ or less than 1 kΩ?

If the resistance is ∞ or less than 1 kΩ, short circuit occurs on the main circuit.

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

Compressor harness connector disconnected from the outdoor unit PCB

Measure resistance between the terminals of the DB1

Measure resistance between the terminals of the compressor

Evaluate the measurement results for a judgment

Sign off on the power module check

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 continuity between the following 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

Sign off on the electronic expansion valve check

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

You can remove the main PCB when you disconnect the lead wires on the terminal board without removing the electrical box.

2 Remove the screw on the terminal board.

3 Release the 2 earth terminals.

5 Unfasten the 3 hooks on the upper side.

6 Lift and pull out the main PCB.

Warning: This procedure requires trained personnel with PPE!

Control voltage between pins 3 - 4

Rotation command voltage between pins 2 - 4

2 pulses output at pins 1 - 4 when fan motor is rotated 1 turn by hand