Daikin Indoor Cooling/Heating Unit FXTQ54PAVJU

All wiring removed from the PCB where power transistors are mounted on

Power supply turned OFF and 10 minutes or more have passed before resistance measurement

If using analog type of multimeter, measurement made in resistance measurement mode in the x1 kΩ range

If using digital type of multimeter, measurement made in diode check mode

Sign off on the power transistor check

Superheated degree of suction gas

Superheated degree of suction gas

Electronic expansion valve open?

Warning: This procedure requires trained personnel with PPE!

Compressor PI control in cooling

Low pressure protection control

Superheated degree control in cooling

Superheated degree control in heating

Check for High Pressure in cooling

Check for High Pressure in heating

Check for broken wire of the relay wire (p.299)

Procedure for checking outdoor-outdoor unit transmission wiring for broken wires

Procedure for checking indoor-outdoor unit transmission wiring for broken wires

Check Fan Motor Connector (Power Supply Cable) (p.300)

Check Fan Motor Connector (Signal Cable) (p.300)

Warning: This procedure requires trained personnel with PPE!

Electronic Expansion Valve Coil Check

Remove the connector for electronic expansion valve (X7A) from PCB

Measure the resistance value between pins

No continuity between White and Yellow

Resistance value between White and Orange

Resistance value between White and Orange is approx. 300 Ω

Resistance value between White and Red

Resistance value between White and Red is approx. 150 Ω