Daikin Outdoor Heat Pump ARXS20G3V1B

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

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

Thermistors disconnected from the PCB

Measure the resistance of each thermistor

Upload a photo of the tester reading

Select the model of the thermistor

Sign off on the thermistor resistance 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 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.

Preparation: Remove the panels and disconnect the connector for the fan motor according to the “Removal of Outer Panels / Fan Motor”.

Disconnect the connector for the overload protector [S40]

Disconnect the connector for the four way valve coil [S80]

Disconnect the 2 connectors for the reactor

Disconnect the relay connector for the compressor

Disconnect the connector for the electronic expansion valve coil [S20]

Pull out the outdoor heat exchanger thermistor. Be careful not to lose the clip for the thermistor.

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.