Many of these devices have strainers on the input (garden hose connection) of the pump. Remove the hose and check and clear debris from strainer. Reconnect hose and turn on supply water. Do NOT start engine / motor. Pop the nozzle from the end of the wand and squeeze water trigger. Hose pressure water (or less) should flow from the wand. Of not, youll have to see if water is leaving the pump by inserting the nozzle (or something that will if it) into the hose connector. If water still does not flow - there is an issue with the pump.
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