I've been hearing kind of a whining sound coming from my pump motor (Jandy Stealth 1.5hp). Initially, I thought it was the motor bearings beginning to fail. However, my filter pressure (Jandy CV340 cartridge), normally about 10psi is up to about 18psi. I cleaned the cartridges and replaced them, but the pressure is still 18psi. I noticed the pump is much more quiet at 0 pressure while it's priming, then the whining gets louder. Thinking the cartridges may need to be replaced, I removed them from the filter and started the pump. Still at 18psi. I did check the pump with a stethoscope and the motor housing is pretty quiet, however, the pump portion whines loud. I am assuming I have a blockage somewhere and when the pressure gets high, the impeller is making the noise trying to move the water. How can I determine where the problem lies?
20k gallon gunite pool with a Jandy CV340 cartridge filter, Jandy Stealth 1.5hp single speed pump, T15 Salt Cell, Polaris 280 cleaner with booster pump.