Yeah, tis happens to my modded powerhead too. I just unplug it and hope for the best. If it doesn't spin correctly, then I'll stick my finger into the powerhead and try to manually move the impeller in the correct direction.
When I built mine I put a small piece of acrlic rod just above where the prop spins and sticking out just enough to hit the prop when it reverses and this will kick it to spin the other way.
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