Make sure your pump is running along with the booster pump. Also on the Polaris swivel hose the Acorn shaped part (reverse valve )is not staying on. Hope this helps.

did you found out the problem yet, we have this problem since three weeks, all parts replaced, wiring ok, nobody has a clue

I just installed a new booster pump and had the same issue at first. the outlet would push water with the pump on but when I turned on the booster it had no pressure. since the booster pump is a pass thru when off the water just flows thru it. when turned on it pushes water in 1 direction so I realized the old pump had the input/output hoses reversed. I disconnected the hoses to see which one spit out water that needs to be the input. once i reversed the hose it worked.

same problem…any answers?

Check start capacitor! Could be failing!
Internal thermal protection going bad! Need motor shop or if you have an electrical diagram an electrician can disconnect!
Hope this helps! Good luck!

My problem is one rpm of booster pump! Only idea I have is start capacitor or is it a start/run! For around $15 I can replace which I think is a good alternative to a $200 to $300
dollar motor!

any solution?

having same problem. looks like no answers.
Pump is not leaking
seal is not leaking
do not detect air coming in

But pump does not increase flow rate and polaris is not receiving enough water flow rate.

i’m having the same issue. are you able to figure it out?

did you ever get an answer ? i have the same problem with my polaris pump, does not make a difference in the flow iof ewater if it is on or off , no pressure to run Polars , Thank you for any advise .