Pulsating pressure indicates air in the system or a water supply issue.
- Primary Fix: Hold the trigger down and let the machine run until a steady stream resumes. This purges air from the inlet hose.
- Check Water Supply: Ensure your water supply meets the machine's requirements. Use a hose with a minimum 1/2-inch diameter. Avoid long, thin hoses.
- Inspect for Blockages: Clean the spray nozzle. Debris here causes pulsation.
- Clean the Inlet Filter: Locate and clean the water inlet filter.
- Straighten the Hose: Remove any kinks or blockages in the hose.
If that didn't work: The pump might be sucking air due to a loose hose connection. Check all hoses and connections are airtight. If valves are dirty or seals are worn, you'll need to clean or replace them. For pump seal issues, contact Sun Joe customer service at 1-866-766-9563.