Keurig Not Brewing or Showing an Error? Troubleshooting Guide
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Quick Answer: Most Keurig brewing failures come down to one of three things: a clogged needle, mineral scale, or an air-locked pump. Cleaning the entrance and exit needles, descaling the machine, and priming the pump resolves the large majority of no-brew, short-cup and "Add Water" problems.
"Add Water" Light Stuck On
If the "Add Water" light stays on even with a full reservoir, the machine isn't reading the water level.
Fix:
- Remove the reservoir, empty it, and reseat it firmly so it locks into place.
- Clean the reservoir and the magnet/sensor area — debris can block the level sensor.
- Refill to the MAX line and reseat once more.
Keurig Brews a Short or Partial Cup
A cup that comes out half-full usually means water flow is restricted somewhere.
Fix:
- Clean the entrance and exit needles (see below) — old grounds are the usual cause.
- Descale the machine; scale narrows the internal water lines.
- Make sure the reusable pod's grind isn't too fine, which slows flow.
Keurig Won't Brew at All
If the machine powers on but nothing happens, work through these in order:
Fix:
- Check the reservoir is seated and has water above the minimum line.
- Clean the needles in case they're fully blocked.
- Descale if it's overdue.
- If it still won't brew, the pump may be air-locked — see the priming step below.
Clogged Entrance & Exit Needles
The needles that pierce the top and bottom of the pod collect coffee grounds and oils over time, and a blocked needle restricts or stops flow.
Fix:
- Power off and unplug the machine.
- Lift the handle and locate the entrance needle under the lid; use a straightened paper clip to gently clear the holes.
- Clean the exit needle in the bottom of the pod holder the same way.
- Run a water-only cycle (no pod) to flush debris.
Do this monthly if you brew daily.
Air Lock: Priming the Pump
If a Keurig has run dry, or after cleaning, an air bubble can stop the pump from drawing water.
Fix:
- Make sure the reservoir is full.
- Run several water-only cycles (no pod) — the flow usually re-primes itself.
- If needed, gently tap the side of the reservoir, or lift and reseat it, to release trapped air.
When It's the Reusable Pod, Not the Machine
Sometimes the brewer is fine and the reusable pod is the problem:
- Grind too fine slows or stops flow — use a medium-fine grind.
- Overfilled pod restricts water — use 8-10 g and level it.
- Torn mesh lets grounds into the exit needle and clogs it — replace a worn pod.
If a problem only happens with the reusable pod and not with factory K-Cups, start here.
Frequently Asked Questions
Why won't my Keurig brew?
Most often a clogged needle, mineral scale, or an air-locked pump. Clean the needles, descale, and run water-only cycles to re-prime.
Why does my Keurig only brew a partial cup?
Restricted water flow — usually a clogged needle or scale buildup. Clean the needles and descale the machine.
Why is the "Add Water" light on when the tank is full?
The machine isn't reading the water level. Reseat the reservoir firmly and clean the sensor area.
How do I clean a Keurig needle?
Unplug the machine, then use a straightened paper clip to gently clear the entrance needle under the lid and the exit needle in the pod holder, and run a water-only cycle.
My Keurig stopped working after running dry — what do I do?
The pump is likely air-locked. Fill the reservoir and run several water-only cycles to re-prime it.
Could my reusable pod be causing the problem?
Yes. A grind that's too fine, an overfilled pod, or torn mesh can all restrict flow. If the issue only happens with the reusable pod, check those first.