Display alternates between “ADD WATER” and normal screen; brewer sometimes starts but stops mid-brew.

Safety first: Unplug the brewer before inspection.

• Inspect reservoir for cracks: Remove and hold the tank up to a light. Look for hairline cracks near the float chamber that could affect buoyancy.
• Check magnet strength: Move the float up and down; you should feel some resistance from the magnet. If the float is waterlogged or the magnet is loose, replace the reservoir.
• Stabilize the reservoir: Ensure the brewer is on a level surface. Press the reservoir firmly down until it clicks or feels fully seated.
• Test with a different reservoir (if available): If you have access to a compatible Keurig reservoir, swap it to see if the issue disappears. This isolates the problem to the tank vs. internal sensor.
• Persistent intermittent behavior: Likely a failing reed switch or sensor on the main control board. This requires disassembly and should be handled by a qualified technician.