Daikin Outdoor Heat Pump RXS20G2V1B9

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

Remove the outer panels according to the “Removal of Outer Panels / Fan Motor”.

Remove the electrical box according to the “Removal of Electrical Box”.

1 Remove the screw and remove the reactor.

2 The partition plate has a hook on the lower side. Lift and pull the partition plate to remove.

EV connector correctly connected to the PCB

EV generates latching sound when power is turned off and on again

Continuity confirmed when connector is disconnected and checked with a tester

Check the continuity between the pins

EV coil is not faulty if there is continuity between the pins

Outdoor unit PCB is not faulty if continuity is confirmed

Note: The latching sound varies depending on the valve type

Sign off on the electronic expansion valve check

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

Screw on the terminal board removed

Forced operation button PCB pulled out

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

Voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V?

Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

Compressor harness connector successfully disconnected?

Measure resistance between the terminals of the DB1 and the terminals of the compressor with a multi-tester.

Enter the resistance measurement

Is the resistance measurement within the acceptable range?

Sign off on the power module check

Warning: This procedure requires trained personnel with PPE!

Measure the power supply waveform between No. 1 and No. 2 on the terminal board

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero cross?

Sign off on the power supply waveforms check