Hello Chris. We are sorry to hear you're experiencing this issue. This can be caused by several reasons like a broken impeller, an impeller not seated in place, pump not sitting in enough water, pump being dropped causing damage internally. We ask that you call in, so we can do some troubleshooting and see what could be causing the issue. Please contact our Customer Care Team at 1-888-412-6001, Monday – Friday, between 8 AM to 5 PM ET. We hope you will give us the opportunity to help.
Your TotalPond Water Gardening Specialist, Mary