I did this yesterday and scared myself to death.
I thought I had totally burnt up the pump. đ I NEVER turn on backwash & walk away, but I was just having a really crazy day & I did...âšī¸ by the time I realized, the pump sounded funny & the water had dropped a little in the pool (full size in ground pool)
I began adding water back & let the motor cool for a while. When I checked back later & re started it, the water began to flow again & it seems ok so far. I literally cried because I thought I had totally broke it on Fathers Day in middle of a BBQ đ
I still hope I don't find any damage but best advice I can give---never walk away for even a minute!!! I got distracted so quick!!