“PRIME” message appears intermittently; brewer sometimes brews but often stops with little or no water output.

Safety first: Unplug the brewer before any inspection.

• Perform a thorough descale: Use Keurig descaling solution and run repeated cycles to dissolve internal scale that can intermittently block flow.
• Check reservoir valve: Press the valve at the bottom of the reservoir with a clean tool over a sink to ensure water flows freely.
• Inspect for leaks or bubbles (advanced): With the cover removed (if you are experienced and the unit is unplugged), check silicone hoses for loose clamps or cracks that could draw in air.
• Monitor pump sound: A grinding or rattling noise suggests a worn impeller; replacement of the pump is recommended.
• Ongoing intermittent PRIME errors: Have a technician test and replace the inlet pump or associated tubing as needed.