ADD WATER / PRIME
Keurig
Combined Water Level and Inlet Detection Fault
Alternating “ADD WATER” and “PRIME” messages; unit will not brew even with full reservoir.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Defective water reservoir magnet or float, Failed reed switch on main board, Severe airlock in inlet line, Control board logic fault
How to Fix / Troubleshooting
Safety first: Unplug the brewer before troubleshooting.
- Swap reservoir (if possible): Test with another compatible Keurig reservoir to rule out a bad float or magnet.
- Clear airlock: Use a turkey baster to force water into the base inlet as described in PRIME troubleshooting, then reseat the reservoir.
- Descale: Run a descale cycle to ensure internal passages are clear.
- Hard reset: Unplug for 10 minutes, then plug in and test again.
- If both messages persist: The internal reed switch or control board is likely faulty and will require professional replacement.
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Repair Difficulty
Hard
4/5
Required Part
Water Level Reed Switch
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