When it comes to problems with a sewer ejector pump, there are a few common causes to consider. Some of these include:

• Clogs: The most common cause of problems with sewer ejector pumps is the buildup of debris, grease, and other substances that can clog the pump or its pipes. This can obstruct the flow of wastewater and potentially lead to pump failure.  
• Power issues: Sewer ejector pumps rely on electricity to function. Electrical problems, such as a tripped circuit breaker or a faulty motor, can cause the pump to stop working or experience reduced performance. 
• Float switch malfunctions: Sewer ejector pumps typically have a float switch that senses the level of wastewater in the pump basin. If the float switch is not operating correctly, it may fail to activate the pump or cause it to run continuously, leading to potential issues.
• Mechanical failures: Over time, various mechanical components of the sewer ejector pump can wear out or break. For example, impellers can become damaged or worn, resulting in reduced pumping capacity or failure.
• Incorrect installation or sizing: If the sewer ejector pump is installed improperly or its capacity is not properly matched to the demands of the system, it can result in operational issues. This can include issues with pump cycling, inadequate pumping capacity, or premature wear and tear.