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Well you can start by checking to see if the pump is getting power. At the very least if you do not know how to run a meter have someone actuate the sprayer button and listen for the pump to try and pump.
Ideally should just unplug the pump and have someone actuate the spray button check for power that will tell you if you have power headed there and if you need to look for a fuse or other issues or if the issue is with the pump itself (not likely) or if you have a plugged line before the spray nozzles (possible)
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