Keurig Says “Prime”? 6 Fixes That Actually Work

If your Keurig lights up with “Prime” (or “Please Prime”) and refuses to brew, the machine is telling you one thing: it can’t pull water from the reservoir into the pump. The good news is that the cause is almost always something you can fix in a few minutes at the counter, with no tools beyond a paper clip.

Work through the fixes below in order. They go from the most common, quickest causes to the less common ones, and most people are brewing again by step 3.

Why a Keurig says “Prime”

The “Prime” message appears when the brewer’s sensors or pump can’t confirm that water is flowing. In practice, one of four things is going on:

• The reservoir isn’t seated properly, so its valve at the bottom never opens and water can’t reach the pump.
• The water level is too low for the brew size you picked.
• A needle or water line is clogged with coffee grounds or mineral scale, so water can’t get through.
• There’s an air bubble in the line, usually after the reservoir was removed mid-brew or the machine was moved.

Fix 1: Reseat the reservoir

This solves the problem more often than anything else.

1. Lift the reservoir straight off the base.
2. Check the valve at the bottom of the reservoir and the opening it sits in on the base. Wipe away any grit or scale you see.
3. Fill the reservoir comfortably above the MIN line.
4. Set it back down firmly and wiggle it gently side to side until it drops fully into place. You should feel it settle.

Now try brewing a water-only cup (no pod) on the largest size.

Fix 2: Check the reservoir float

Keurig’s manuals don’t mention it, but many owners find that reservoirs with a small float inside can cause false “empty” readings when the float sticks. If yours has one and it’s stuck, stained with scale, or upside down after a wash, the machine may think the tank is empty.

1. Empty the reservoir and look for the float (often a small plastic piece in a channel on one side).
2. Make sure it slides up and down freely. Rinse away any residue with warm water.
3. If it came out during washing, reinstall it the way the manual shows. It only works in one orientation.

Fix 3: Clean the needles

Coffee grounds are the second most common culprit. Your Keurig has two needles: the entrance needle in the lid (it punctures the top of the pod) and the exit needle at the bottom of the pod holder.

1. Unplug the brewer. Open the handle and remove the pod holder (on most models it pops out when you push up from underneath).
2. Straighten a paper clip and gently push it up into the exit needle tube, moving it around to loosen debris. Rinse the pod holder under the tap.
3. Look under the lid for the entrance needle. Insert the paper clip into the hole(s) around it and wiggle to clear grounds. Keurig 2.0 brewers came with an orange maintenance tool that does this more neatly. For current models, Keurig’s guides simply call for a paper clip.
4. Reassemble, plug in and run two water-only brews.

Fix 4: Burp out an air bubble

If the machine hums but no water moves, you may have an airlock. On a K-Slim, K-Supreme or K-Supreme Plus, try Keurig’s official purge first: power off, then hold Brew + 12 oz for 5 seconds until water dispenses. On a K-Mini, press Power, then hold Brew for 5 seconds. Otherwise:

1. With the reservoir removed, open and close the brewer handle a few times.
2. Reseat the full reservoir firmly and run a water-only brew.
3. If that doesn’t work, remove the reservoir, give the brewer a few gentle pats on the sides and back, then reseat it and try again. (You’ll also see a turkey-baster or straw trick online. It’s not something Keurig recommends; see our not-pumping guide for the details and caveats.)

Fix 5: Descale the brewer

If your water is hard, mineral scale gradually narrows the internal lines and can starve the pump. If you haven’t descaled in three months or more, do it now. Our step-by-step guide covers every model: How to descale a Keurig.

Fix 6: Reset the brewer

Sometimes the electronics just need a restart.

1. Turn the brewer off and unplug it.
2. Remove the reservoir and leave everything unplugged for about 30 minutes.
3. Plug back in, reseat a full reservoir, and run a water-only brew.

Still says “Prime”?

If you’ve worked through all six fixes and the message won’t clear, the water pump or a sensor may have failed. Keurig’s guides say that if a fix doesn’t work after two tries, you should contact Customer Service at 1-866-901-BREW (2739). Brewers have a limited one-year warranty. Have the model name and serial number from the bottom of the machine handy. If it’s out of warranty and several years old, replacing it is usually cheaper than a repair.