Prime Error
Keurig Coffee Machine
Severity: ModerateWhat Does This Error Mean?
The Keurig 'Prime' message means the machine cannot draw water from the reservoir — it is asking you to help it prime (fill) the water pump. This is caused by a repositioned reservoir, an airlock, or debris in the water inlet.
Affected Models
- Keurig K-Elite
- Keurig K-Classic
- Keurig K-Select
- Keurig K-Café
- Keurig K-Duo
Common Causes
- Water reservoir was recently removed and an airlock formed in the water line
- Debris or mineral scale is blocking the reservoir inlet screen
- Reservoir is not seated correctly
- The reservoir's internal float sensor or magnet is stuck
- Machine was shipped or moved and the water lines lost their prime
How to Fix It
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Remove the water reservoir completely, rinse it, and inspect the bottom of the reservoir for the small rubber inlet valve. Push it gently with your finger — it should move freely.
This inlet valve controls water flow into the machine. If it is stuck closed (common after limescale buildup), no water can enter the pump.
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Look inside the machine where the reservoir sits. Use a torch to inspect the water inlet needle — rinse it with a syringe or turkey baster filled with clean water to flush debris.
A partially clogged inlet screen reduces flow enough to trigger the Prime alert.
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Refill the reservoir, reattach it firmly, then lift and push it down once more to ensure a positive seal.
Sometimes the act of removing and firmly reattaching the reservoir is enough to break an airlock and restore the prime.
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With the reservoir attached, open and close the K-Cup lid 5 times without a pod inside, then attempt a brew cycle.
Opening and closing the lid activates the needle mechanism and can help draw water through the lines.
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Power cycle the machine: unplug for 60 seconds, plug back in. As soon as it powers on, attempt a water-only brew cycle immediately.
Starting a brew cycle immediately after power-on, before any air can re-enter the lines, sometimes successfully primes the pump.
When to Call a Professional
The Prime error is almost always a DIY fix. If it persists after cleaning the inlet and reseating the reservoir, contact Keurig support at keurig.com/support.
Frequently Asked Questions
What does 'priming' a Keurig mean?
Priming means filling the water pump and internal lines with water so the pump has something to push. A dry pump cannot create enough pressure to brew. The Keurig shows the Prime message when it detects that the pump is running but no water is flowing — it needs you to help get water into the pump.
Will the Prime error damage my Keurig if I keep trying to brew?
Running the pump repeatedly while it is dry can wear it out over time. Do not press brew repeatedly if the Prime message is showing. Fix the priming problem first, then attempt to brew.