Check the chlorine levels in the pool and adjust if necessary.
Open the filter canister, remove the filter and examine for excessive buildup of dirt or damage to the filter such as holes.
Check for a blocked strainer screen at the inlet nozzle and unclog if necessary.
Set the timer to run the filter pump for longer periods.
Check for blockages in the inlet or outlet lines. Also look for air leaks in the inlet line.
Open the filter canister, remove the filter and examine for excessive buildup of scale or dirt.
Make sure the lines from the pump to the inlet and outlet nozzles in the pool are not reversed.
Verify that the water level in the pool is above the level of the inlet nozzle.
Check the strainer screen and unclog if necessary.
Look for air leaks in the inlet hose.
Verify that the pump motor operates when energized and that the impeller in the pump turns.
Remove the canister cover and make sure the O-ring is properly installed.
Tighten the canister cover if it appears loose.
Clean or replace the filter if it is obstructed due to buildup of dirt or scale.
Open the air-release valve on top of the filter canister to release air. Close the air release valve when water begins to spurt out of it.
Verify that the lines from the pump to the inlet and outlet nozzles in the pool are not reversed.
Make sure all inlet and outlet hose connections fit properly and that nuts are tightened.