The answer to 'why is my sump pump won't flush' is that there are several common causes, including a clogged or blocked discharge line, a faulty sump pump, or a problem with the float switch. The sump pump is responsible for removing excess water that collects in the sump pit and preventing basement flooding. If the pump is not flushing properly, it could indicate an issue that needs to be addressed.
Some common symptoms of a sump pump problem include the pump running continuously, the pump not turning on at all, or water remaining in the sump pit after the pump has run. The solutions may involve unclogging the discharge line, replacing the sump pump, or repairing or replacing the float switch. In some cases, the issue may be with the electrical connection or the sump pit itself.