Daikin Cooling-Only Outdoor Unit RKN12KEVJU

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

Enter the voltage between (+) and (–) of the diode bridge (DB1)

Enter the resistance between the pins of the DB1

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

Sign off on the main circuit short check

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

1. Remove the shield plate (2).

 Remove the electrical box according to the “Removal of Electrical Box / Vertical Blades”.

1 Unfasten the hooks at the upper 2 positions of the shield plate (2).

2 Unfasten the hook at the lower position, and remove the shield plate (2).

1 Remove the screw of the swing motor.

2 Unfasten the hook, and disconnect the connector.

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

1. Remove the right side panel.

Remove the indoor heat exchanger according to the “Removal of Indoor Heat Exchanger”.

1 Remove the screw of the right side panel.

2 Unfasten the hook of the right side panel.

2. Remove the fan rotor and the fan motor.

1 The fan motor has 3 projections on the right side.

Check the connection of connector

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

Check the motor control voltage (pins 4 - 3)

Check the rotation command voltage (pins 4 - 2)

Check the rotation pulse (pins 4 - 1)

Fan motor wire breakdown / short circuit check

Check the connector for connection