I have a Pentair Intelliflo pump system and lately it won't kick on to filter pool. ... It starts to prime and it won't create enough pressure on gauge to hit the threshold. It will get close and then it starts priming process over again
Pool & Spa - Pentair - 3hp Whisperflo Pool Pump In - Ground
Answers & Comments
It sounds to me that your diffuser oring needs to be replaced. This is a common problem with that pump. The oring stretches out or breaks and this will keep the pump from creating a vaccum. This is easy to check. Shut the power off to the pump. Remove 6 bolts holding the seal plate together (do not remove the bolts that mount the motor to the pump). Their will be 2 bolts at top and bottom on each side of the seal plate that have no nuts and two bolts in the middle on each side of the seal plate that have nuts. Grab the motor and pull it away from the pump. You will see a cone on the front of the assembly. Check the oring and make sure it fits snug around the cone. If not, replace the oring. This is most likely what is wrong with your pump.