I did replace the Pump motor around 1-2 months. Today , the pump is working, however, the pressure is zero. No suction at all. The motor is A.O Smith Century 1.5 HP and the pump is Whisperflo. I tried to check for a leak, I was not able to find. I did also try to change the setting to Spa, also nothing happen. I can hear the motor pump on and the Motor Shaft is turning fast, I can see when open the back. Can you please advise what can be the possibility?