There could be a number of things preventing your pump/jets from pumping water, however if this began immediately after draining and refilling, it is not uncommon to have air in the pump preventing water flow. This is commonly called an "air-lock", and you'll need to bleed the air out of the system to start the water moving again. If this problem did not occur immediately after adding water to your hot tub, almost certainly this does not pertain to you. Frequently the air can be forced from the pump by putting a garden hose down into the filter compartment and forcing water through the plumbing. If this doesn't work, the air will have to be manually bled from the pump. Look for tiny bleed screws on the end of the pump (see image below). Open (loosen) these bleed screws to allow air to escape. Always do this with the power off and be ready to close them quickly when water begins spray out with the air. If you have a bleed screw on top of your filter, be sure to bleed air from there too. If you don't have any bleed screws (or this procedure doesn't correct the problem), the union on top of the pump can be slightly loosened to allow air to escape (when retightening it shouldn't be more than hand-tightened, very snuggly). After bleeding, try turning the power on again and see if the jets work. You may have to bleed the lines several times before the jets are fully functional, but you should see an improvement each time. As long as you get the majority of air out of the lines and the jets start flowing again, the remainder of the air will work its way out.
If you didn't just drain and refill, and you don't think you have an air lock (you probably don't), try the following;
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