Daikin Air Conditioner FTX36NVJU

Warning: Ensure the voltage between (+) and (–) of the power module is approximately 0 V before proceeding

Disconnect the compressor harness connector from the outdoor unit PCB

Compressor harness connector disconnected?

Press the protrusion on the connector to disengage it

Measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter

Sign off on the power module check

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is approximately 0 V before proceeding

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 less than 1 kOhm?

If the resistance is less than 1 kOhm, a short circuit occurs on the main circuit

Sign off on the main circuit short check

Warning: This procedure requires trained personnel. Always ensure power is off before starting.

If power is not off, turn it off and wait until the charged voltage of the built-in smoothing electrolytic capacitor drops to 10 VDC or below.

Has the charged voltage of the built-in smoothing electrolytic capacitor dropped to 10 VDC or below?

Upload a photo of the inverter analyzer installed instead of a compressor

Activate power transistor test operation from the indoor unit.

Did the inverter analyzer function properly?

Describe any issues found during the test

Sign off on the inverter analyzer check

Warning: This check 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?

Upload a photo of the measured waveform

Sign off on the power supply waveforms check

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

Thermistors disconnected from the PCB

Note: The room temperature thermistor is soldered on the PCB

Connector to the control PCB disconnected before measuring the resistance

If the connector of indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor

Indoor heat exchanger thermistor removed

Resistance of the indoor heat exchanger thermistor

Sign off on the thermistor resistance check