Yesterday morning after all the heavy rain here in KY i went to check on my new 3100. The commode was almost full of water. There is no water hookupin use and the pump was not on. I flushed it and checked it this AM. A small amount of water was in the bottom. Any ideas how this could happen. I thought maybe rain came in the vent somehow. Any ideas would be appreciated. Thanks
If the pump had been on, and then turned off, some pressure remains....especially if there is air in the system. If the toilet valve had a slow leak..that excess water would have (could have) slowly run into the bowl. But typically that would only be 4 to 8 ounces. Not enough to almost fill the bowl. Did you by any chance check the toilet right after you parked it? If the toilet valve had a slow leak...it could have been leaking while the pump was on....and you just didn't notice it.
No way rain could have backed up into the bowl.