To test it: Remove pump from the pit, take it outside, insert pump into a bucket full of water and plug it in. Here, you have to be careful: pump will shoot water out of the bucket pretty fast - so make sure the electrical connection is not in a way of water. Also, position yourself so you don't get sprayed. If possible, attach large diameter hose to the discharge and lead it away from the pump.
You may have piece of nylon thread in the pit and that will stop propeller from functioning properly.
When we service sewer ejector pumps, we always remove all water from the pit, vacuum all debris and hose down the pit with clean water. When we re-insert and reconnect the pump, we always let clean water run into the pit and observe several pump actuations before we cover up the pit.
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