Daikin Outdoor Heat Pump RXN09KEVJU

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)

Measure the resistance between the pins of the DB1.

Enter the resistance between the pins of the DB1

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

If the resistance is 'infinity' or less than 1 kW, a short circuit occurs on the main circuit.

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

Resistance measurement within 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.

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

Compressor stopped before disconnecting the refrigerant pipe?

If the drain hose is embedded in the wall, disconnect the drain hose beforehand.

Indoor unit lifted with a wooden base?

Place a plastic sheet under the drain hose as remaining drain may leak.

Flare nut for gas piping disconnected with 2 wrenches?

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

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

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.