Quick answer: Most fountain failures are caused by a clogged pump, low water level triggering auto-shutoff, or a dirty impeller — all fixable with a basic cleaning in under 15 minutes.
The impeller is a small magnetic rotor inside the pump that moves water. Hair, debris, and mineral buildup are the most common causes of pump failure. Remove the pump, take out the impeller (it usually pulls straight out), clean all parts with a small brush, and reassemble. This fixes most 'dead fountain' issues.
Many fountains have an auto-shutoff that activates when water drops below a minimum level — a safety feature to prevent the pump running dry and burning out. If your fountain suddenly stops, check the water level before disassembling anything. Refill and wait 30 seconds.
In hard water areas, white mineral deposits build up on the pump housing and filter. Soak affected parts in undiluted white vinegar for 30 minutes, then scrub with a soft brush. Rinse thoroughly before reassembling — vinegar residue can deter cats from drinking.
Monthly pump cleaning prevents most failures. If cleaning doesn't restore function and the fountain is under warranty, pump replacement parts are usually available separately and are inexpensive.