Troubleshooting Tips for Airlock in a Pool Cover Pump
Keeping a pool cover clear of standing water is an important part of pool maintenance, and a dependable pool cover pump helps make the job easier. If your pool cover pump sounds like it's running but isn't moving water, it may be experiencing an airlock. Airlock is a common issue that reduces or stops pumping performance altogether.
What is Airlock?
Airlock occurs when air becomes trapped inside the pump, preventing water from reaching the impeller and moving through the discharge line. When this happens, the pump may run without pumping water or experience reduced performance.
Troubleshooting Airlock in Pool Cover Pumps
Airlock is most caused by debris becoming stuck in the anti-airlock mechanism, a relief port designed to release trapped air and keep water flowing through the pump. Over time, debris or buildup can block this opening, preventing the pump from clearing air and operating as intended.
However, debris blocking the anti-airlock mechanism is not the only way pool cover pumps can become airlocked. The position of the pump, damage to the discharge hose and other issues can affect the pump's performance. To troubleshoot airlock in a pool cover pump, follow these steps.
1. Disconnect the Power
Unplug the pump before performing any inspection or maintenance.
2. Remove the Pump Cover
Using a screwdriver, remove the screws securing the cover and carefully lift the cover off the pump.
3. Inspect the Airlock Relief Port
Locate the relief port; on the Little Giant APCP-1700 Series Pool Cover Pump, this is directly above the discharge outlet. Check for dirt, grass or other debris or buildup that could be obstructing the opening. If necessary, carefully clear the blockage using a toothpick, small screwdriver or unfolded paperclip. For a step-by-step demonstration of this on the Little Giant APCP-1700 Series Pool Cover Pump, watch our video.
4. Reassemble and Test the Pump
Reinstall the cover and secure it with the screws. Place the pump in a bucket filled with enough water to fully cover the unit, then plug it in and verify that water is flowing properly.
5. Verify Pump Positioning
If the relief port is clear and the pump works fully submerged in water, check the pump's placement on the cover. The pump should sit level, remain fully submerged and be positioned where it cannot draw in air.
6. Check for Damage or Leaks
Inspect the discharge hose and pump components for cracks, loose connections or other damage that could affect operation.
7. Maintain Adequate Water Depth
A low water level around the pump can increase the chance of air entering the system. Ensure enough water is present for continuous pump operation.
Preventing Future Airlock Issues with Your Pool Cover Pump
Regular inspection is one of the best ways to keep your pool cover pump performing reliably. At least once a year, check the anti-airlock relief port and remove any debris or buildup that could restrict airflow. Keeping the pump clean and properly positioned can help prevent airlock and maintain efficient water removal throughout the season.
For additional troubleshooting guidance, always refer to your owner's manual and follow all safety recommendations when servicing pool equipment. With routine maintenance, your pool cover pump can continue to provide dependable performance year after year.