Daikin Inverter Wall Mounted Single Split FTKB12AXVJU

In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit.

Valve caps removed from the liquid stop valve and the gas stop valve?

Forced cooling operation carried out?

Liquid stop valve closed with a hexagonal wrench?

Gas stop valve closed and forced cooling operation stopped?

Sign off on the pump down maintenance

Warning: This check requires trained personnel with PPE!

Measure the power supply waveform between No. 1(Live) and No. 2(Neutral) on the terminal board

Upload the oscilloscope reading

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero cross?

Sign off on the power supply waveforms check

EXV connector correctly connected to PCB

Did EXV generate a latching sound after power cycle

If EXV did not generate a latching sound, proceed to next step

Continuity confirmed using a multimeter after disconnecting connector

If there is no continuity between the pins, EXV coil is faulty

Continuity confirmed between pins

If continuity is confirmed, outdoor PCB is faulty

Sign off on the Electronic Expansion Valve Check

Warning: Ensure the voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt before proceeding

Voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt

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

Measure resistance between power transistor (+) and (-) and the U terminal of the compressor connector

Measure resistance between power transistor (+) and (-) and the V terminal of the compressor connector

Measure resistance between power transistor (+) and (-) and the W terminal of the compressor connector

Evaluate the measurement results for a pass/fail judgment

Sign off on the power transistor check

Set operation off and power off. Disconnect the connector S71.

Control voltage between the pins 3 & 4

Rotation command voltage between the pins 2 & 4

Keep operation off and power off. Connect the connector S71.

Pulses output at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

If NG in step 2 : Defective PCB and replace the outdoor unit PCB.

If NG in step 4 : Defective Hall IC and replace the outdoor fan motor.