Problem: Shuts off, gives me an "OH" and sometimes "FLO" error on the topside control panel.

I've tried replacing the hi-limit; as soon as I put the new one it, it still didn't work, so I put the old back in, reset the breaker and it worked. For a while, I could disconnect the hi-limit at the control pack, plug it back in, reset the breaker and it would run. Now it only runs for about 20 seconds, then I hear a "click" and the pump stops.

Any suggestions?