Compressor detection: adjust the frequency to the lowest, connect the plug to the compressor and turn on the power. After about 2-5 seconds, if the parameters are matched successfully, the compressor will be started directly. If the compressor does not Compressor malfunctions when starting. Once the compressor is started, you need to wait 3-5 minutes for the system pressure to balance before testing again Frequency conversion board detection: connect the frequency conversion board detection line to the refrigerator frequency conversion board communication interface and then supply 220v power to the frequency conversion board; turn on the power switch and wait for the parameters to match successfully to directly start the compressor Frequency adjustment: Turn the frequency adjustment knob to change the operating frequency after the compressor is started, which is convenient for observing the compressor's operating conditions. Solenoid valve detection line: Connect the solenoid valve detection line to the solenoid interface, click the red and green buttons respectively, and listen to the sound of the solenoid valve reversing, the valve body is normal. The main board detects the output of the solenoid valve:Turn off the power of the detector, and clamp the solenoid valve detection clamp to the solenoid valve port (do not disconnect the solenoid valve and the main board). Take refrigerator as an example. Under normal working conditions, the main control board will give a maintenance signal to the solenoid valve every . The corresponding pulse indicator will flash. When the refrigerator starts and stops cooling each room, the corresponding solenoid valve will have a signal for about 5 seconds. . By observing the indicator light on the instrument, if the indicator light switches normally, the output of the main control board to thevalve should be excluded. The focus should be to check the temperature probe, system blockage or llary connection reverse. colour: blue Material: Composite Material Package Contents: 1 x Refrigerator Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.