I've been getting a bit of flooding in my basement this week. I think I tracked it down to the water softener - it has a hose (see below) that leads directly to a drain about 2 feet from the sewage basin. I assume that the drain is connected to the sewage basin, and the water is supposed to get pumped into the septic.
I'm not getting flooding at any other time, which leads me to think that there's nothing wrong with the pump. Maybe... I had about a 1/4 inch of standing water this morning and then the pump cut in and sucked it all up. So, if the pump works, why isn't it sucking up the water before it floods? But if it doesn't work, why isn't it flooding when I run a shower or do the laundry?
It could be a partially blocked drain but if that was the case, why did it drain once the pump kicked in? I just don't get it....
I'd be checking for a sticking float switch on the pump.
Good call. That's exactly what it was. $100 for an hour's labour, as opposed to $800 or so for a new pump. If anything, it was worth the $100 to finally force me to clean out the boxes and boxes of junk I've been storing in the room for years on end.