I have a 4 year old Pentair whisperflo 1HP pump that quit last month. Took the pump in to local pool store that replaced the motor with a new 1.5HP motor. After about 3 weeks, I noticed a buildup of corrosion on one of the outer pump housing screws (like when a battery leaks). There is a Resilience brand salt system on the pool. As I was uninstalling the pump, I noticed it was VERY hot. Took it back in to the same pool store to figure out why the corrosion was there and they said the pump had overheated (possibly from running dry or a blockage ... neither of which sounds feasible since I know it didn't run dry and there was not an above average accumulation of particles in the pump) and the impeller had melted/warped. They wanted to replace the impeller and give it back to me.
What caused the motor to overheat in the first place? What caused the corrosion after only 3 weeks of operation? Is the higher HP motor to blame?
Thank you for any assistance!