Impeller Damage
 

PH impellers damaged by wavemaker timers can apparently can be repaired in seconds. My MJ power heads don't seem to handle timers for too long until the impellers are messed up. Got tired of buying replacement impellers and tried glueing them back together with a 2-part epoxy. Seems they work just fine so far. I'll make another note when the glued ones fail again.

I've been using frag glue (cyanoacrylate gel) to fix mine .. the plastic insert tube that sits on the inside of the magnet, I squish some onto that and put it back together.

I don't know how long the fix will last, but, at least it gets a powerhead going again fairly soon.