Add Water — Light — reservoir low or sensor fault
The Add Water indicator signals the reservoir is below the minimum fill line or the magnetic float sensor is not registering water. The brewer will not start until resolved.
- Keep using it?
- Yes — fix when convenient
- DIY difficulty
- Easy
- Typical cost
- $15-30
- Verified against
- support.keurig.com ↗
The fix
Keurig replacement water reservoir
Water reservoir low, misseated, or float sensor no longer reading
Diagnose first: Refill, reseat firmly, and check the float moves freely before buying a new reservoir — most Add Water lights are a seating or scale issue, not a failed part. Only replace the reservoir if the light stays on with a full, clean, properly-seated tank.
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How to fix it
- Remove the reservoir, fill to the MAX line with fresh water, and reseat firmly on the base
- Check the float inside the reservoir moves freely up and down
- Clean the reservoir with warm soapy water to remove scale around the float
- Tap the side of the reservoir to dislodge a stuck float
- If the light persists with a full, properly-seated tank, the sensor in the base has failed and the unit typically needs replacement
Why it happens
Typical signs: Add Water light is lit · Brewer will not start a cycle · Light stays on even when reservoir is full · Light flashes during brew
- Reservoir genuinely low Water below MIN line
- Reservoir not seated correctly Tank not pushed fully onto the base magnets
- Stuck or missing float magnet Float assembly in the reservoir is jammed by scale or detached
- Failed water level sensor Hall-effect sensor in the base no longer reads the float
Related repair guides
More Keurig coffee maker codes
Frequently asked questions
What does the Add Water code mean on a Keurig coffee maker?
The Add Water indicator signals the reservoir is below the minimum fill line or the magnetic float sensor is not registering water. The brewer will not start until resolved.
What causes the Add Water code on a Keurig coffee maker?
Reservoir genuinely low: Water below MIN line Reservoir not seated correctly: Tank not pushed fully onto the base magnets Stuck or missing float magnet: Float assembly in the reservoir is jammed by scale or detached
Is it safe to keep using a Keurig coffee maker with a Add Water error?
Yes — fix when convenient. This is rated a minor-severity fault.
How do I fix Add Water on a Keurig coffee maker?
Remove the reservoir, fill to the MAX line with fresh water, and reseat firmly on the base Check the float inside the reservoir moves freely up and down Clean the reservoir with warm soapy water to remove scale around the float
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: support.keurig.com.