Why does the vacuum volume of the vacuum precooler not decrease when the start button is pressed?

　　When the user presses the start key on the touch screen (or the start button on the panel), the equipment operates normally. After waiting for a few minutes, the vacuum volume does not decrease. Check the following aspects:

　　1. Check whether the door of the equipment has been closed in place

2. Carefully observe whether the "O" ring in the door frame is installed in place.

　　3. Check whether the vacuum pump is operating normally and whether the valves of the vacuum pipeline are tightened.

　　Solution: Close the door tightly and lock the door latch. If it is not in place, please install it correctly into the "O" groove.

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