A sewer pump — also called a sewage pump or macerator pump — is used on properties where the wastewater cannot drain to the main sewer by gravity. When this pump stops working, the pump chamber fills up and sewage has nowhere to go, leading to sewage backup and overflow. A failed sewer pump is a plumbing emergency that needs same-day professional attention.
Common Reasons a Sewer Pump Stops Working
Pump Motor Failure
The pump motor is the most common component to fail in an older sewer pump. Motors have a service life typically ranging from 8 to 15 years depending on usage frequency, pump quality, and maintenance history. When the motor fails, the pump simply stops operating even though the float switch may still be activating correctly. A licensed commercial plumber in Sydney will test the motor and determine whether it can be repaired or needs to be replaced entirely. In most cases, pump replacement is more cost-effective than motor repair for older units. Related: 7 Plumbing Emergencies That Cannot Wait.
Float Switch Failure
The float switch detects when the water level in the pump chamber has risen to the activation point and sends a signal to start the pump. When the float switch fails, the pump does not activate even though the motor is functional. A failed float switch is one of the simpler and less expensive sewer pump repairs — the switch is replaced and the pump returns to normal operation. A licensed Sydney plumber will test the float switch as part of diagnosing a non-operating sewer pump.
Blockage in the Pump or Discharge Pipe
Solid material — rags, wet wipes, large debris — entering the pump chamber can jam the pump impeller and cause the pump to stop working or trip its thermal overload protection. A blocked discharge pipe can also prevent the pump from operating effectively even when the motor and float switch are functional. A licensed blocked drain plumber in Sydney will clear the blockage and restart the pump, and advise on measures to prevent the same material from entering the chamber again. Related: Why Does My Drain Keep Blocking After It Has Been Cleared?
Electrical Fault
Sewer pumps operate on a dedicated electrical circuit. A tripped circuit breaker, a blown fuse, a failed capacitor, or a wiring fault can all prevent the pump from receiving power and operating. The first step in diagnosing a non-operating pump is to check whether the circuit breaker has tripped. If the breaker resets but immediately trips again, there is likely an electrical fault within the pump or its wiring that requires a licensed plumber to diagnose and repair.
Pump Has Reached the End of Its Service Life
Sewer pumps are mechanical devices with a finite service life. A pump that has been in service for more than 10 to 12 years and stops working should generally be replaced rather than repaired, as other components are likely close to failure as well. A licensed plumber in Sydney will assess the pump’s age and condition and advise on the most cost-effective approach. Related: How Much Does Emergency Plumbing Cost in Sydney?
What to Do When Your Sewer Pump Stops Working
Stop using all plumbing fixtures immediately to prevent the pump chamber from overflowing. Call a licensed plumber for same-day emergency service. Do not attempt to restart a pump that has stopped without knowing why — if the impeller is jammed, forcing a restart can burn out the motor. If the chamber is close to overflowing, a licensed plumber may need to pump it out manually before carrying out repairs.
If Your Sewer Pump Has Stopped Working in Sydney, Call 1300 071 280
All Day Plumbing repairs and replaces sewer pumps across Sydney, available 24 hours a day, 7 days a week. If your sewer pump has stopped working, call us on 1300 071 280. We offer same-day emergency callouts and upfront pricing for pump repair and replacement.