Abstract: An airless paint spraying system includes a spray tip, a paint pump configured to pump paint from a paint source, and a motor configured to drive the paint pump to pressurize the paint along a flow path to the spray tip. The spray tip releases the paint in an atomized spray pattern. A paint filter is configured to filter the paint. The airless paint spraying system includes a filter diagnostic system configured to receive an indication of an operational characteristic representing operation of the paint spraying system, generate a filter status based on the operational characteristic, and generate an output representing the filter status.