)I believe your version of the LELITPL41 may have a Pump Thermister, which if over heated may cause an open or shorted circuit that will cause the pump to not be energized. The part number should be 9600056 and you can likely find it at a company like 1st Line Equipment . . . here is what it will look like if you open your machine up and look for it (again, you can test the two wires for continuity and see if the thermistor has failed but be sure the machine is UNPLUGGED please). . .
This could also be a component within the pump, a spring for example that has failed. Removing the pump and disassembling it will reveal any sources of this fault.
From your excellent video, which you kindly provided the link to in your original posting, the pump is not being energized. The question is why is your pump not be energized? It could be a shorted wire, a connection that degraded, or a loose wire as etc., or indeed the pump itself (the coil or diode etc.). A good approach is to visually inspect the pump, look for and test any thermal components for continuity (such as like the thermistor pictured above), test the pump itself for continuity in both directions, and look at all its electrical connections (including as connected throughout the machine to switches, wires, etc). and internal components. It does appear your solenoid is opening as some water dribbles out when you throw the switch.
Here's an excellent primer on Vibratory Pumps, including testing them, and the internal components:

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