The primary cause for a pump not priming properly is air getting introduced to the suction side of the pool equipment. The most common reason is the pump lid. With the pool system turned off. Remove the pump lid, empty the strainer basket, inspect and lubricate the pump lid O-ring, pour approximately 5 gallons of water in pump strainer pot, secure the pump lid back to the pump, turn system on and let the pump self-prime for 10-15 minutes. If you are not successful and you know the pool water level is above the skimmers you will need to submit a service repair request.