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your pump will not prime with air in the line. Check the impeller for junk in it. Clear it out by opening the pump lid, and then opening the air bleeder on your filter. That will flush the stuff from the impeller. Check pump lid gasket, and make sure all your baskets(skimmer, and pump) are empty. Prime pump. That should get it flowing. Also, clean or backwash your filter.
whats your question how to prime the pump? if so at the bottom is a 3/4 inch plug screwed into it, or at top, once the pump is hooked up to the lines turn off the power, and unscrew the prime plug fill with water, then screw in tight DO NOT USE THREAD SEALANT THEN THROW THE POWER TO THE PUMP, of course house supply valve must be off 3/4 turn valve off until the line is primed then open the supply line to house slowly to supply the water to all the lines, NOTE WHEN YOU FIRST INSTALL A NEW PUMP, HAS TO BE PRIMED, HAVE TO HAVE SUPPLY LINES FROM WELL TO HOUSE CLOSED TO PRESSURE THE TANK AND TO FILL THE LINES.
simple fix its one of two things you did not prime the spa when filling it meaning that u just did not lay a hose in the spa then fill it you always need to prime the heater first along with the circ pump if you do not you will get a thing call airlock which is what it sounds like air in the main circulation pump for the heater.Also could be that u removed the filter while you still had the spa running an clogged the circ pump or it could be the flowswitch. Sounds like u might have a sundance spa an if the flo is flashing its either the air lock or your pump went or its clogged if the flo sign is not flashing then its the flowswitch but in that case w/a solid flo nothing would b working. To fix the airlock just shut the power down an take your hose an force water into the intake side of the filter area this is what u should always do 1st when you fill it that how you prime yuor pump an when fillin it all the way it best to fill it through the other end of the filter just put the hose into the filter tube w/the screw on it.IF THATS NOT IT THEN FEEL YOUR CIRC PUMP IT WILL BE THE SMALLEST PUMP IN THE SPA IF U CAN NOT TOUCH IT FOR MORE THEN A FEW SECS. THEN IT WENT ON U OR IT CLOGGED