Another Alpha 1000 failed on the newly planted Tomato growbed. It has a hard life anyway running continuously for more than a year for my barrel set.
Removed the pump and found the rotor shaft broke.
The shaft has been ground to a needle point and detached from the supporting rubber mount.
The permanent magnet rotor has deformed probably due to scrubbing the pump inner wall.
That's a sharp point
The rubber mount with broken shaft inside,
Replaced with a spare rotor, no time to change the entire unit. I need to keep an eye on this over the next 2 weeks, may need to replace to a new pump before the festive break next month.