Reeflo is a great company and great customer service. They said if the shaft can't turn it will cause GFCI to fault and the power supply of the pump will fault. Removing any debris or anything in the way of the impellor could cause it start working again.Good luck finding what's wrong. Let us know how you make out. I hope it's nothing too serious.
I found a plastic cap and 3 zip ties in the intake. No idea how they go there. But, I pulled them out, put it on my water change station and plugged it in. It was working no problem. Yaay!
So, I had a friend come over we reviewed all the plumbing. Discovered a union gasket was leaking, (highly compressed). I had other unions not in use that matched that union so we exchanged that. Siliconed it. and leak# 1 resolved.
Leak #2 was the 8 year old bulkhead on my sump. We got the old bulkhead off put on a new nut and gasket. Put it on and couldn't get it to tighten by hand. My friend went and got his plumbing wrenches and we were able to tighten, then loosen and tighten just so the gasket is tight and the bulkhead doesn't move very easily by hand. (this is after draining the sump of 40 gallons of water - 75 gallon sump). That appeared to fix leak #2.
Leak number 3 was where I had some spa flex (1.5") hose connected to a 1.5" male threaded connector that screwed onto my pump. The design was to have the spaflex absorb some of the vibrations from the pump... however, the pvc glue had caused gaps to form in the connector from unscrewing and screwing the hose onto the pump.
I ran to a hardware store, got some wet dry pvc cement, costed the heck out of the spaflex where the adaptors were. Waited 20 minutes for it to be dry to the touch and restarted the pump.
As of this morning, no floods, the return pump was offline for 8-9 hours, no heaters, and tank had dropped to 73. Fish and corals are all fine as of this morning and things are fully operational with no leaks. . . . !!!! I'm checking every few hours just to make sure, but I think I have a solid fix for all three leaks.