ADD WATER / HEATING
Keurig
Control Board Sensor Conflict
Display alternates between “ADD WATER” and “HEATING”; unit never reaches ready state.
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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
Faulty water level sensor, Faulty temperature sensor, Control board firmware error, Loose internal wiring harness
How to Fix / Troubleshooting
Safety first: Unplug the brewer before inspection.
- Verify water level: Fill the reservoir to MAX and reseat it firmly.
- Power cycle: Unplug for 10 minutes, then plug in and observe behavior.
- Descale: Perform a descale to ensure sensors are not affected by scale buildup.
- Inspect for moisture intrusion (advanced): If comfortable opening the case, check for signs of water leaks onto the control board or connectors. Dry thoroughly if found.
- Persistent alternating messages: Likely a control board or sensor failure. Professional replacement of the main control board or sensor harness is recommended.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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