Bunn Fill Valve Stuck Open

On plumbed-in Bunn coffee makers, water continues to flow into the tank and may overflow.

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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

Debris in fill solenoid valve, Worn valve seat, Shorted solenoid coil, Control board stuck output

How to Fix / Troubleshooting

Safety: Immediately shut off the water supply and unplug the brewer to stop the overflow.

Steps:

  • 1. Inspect fill valve: Remove the fill solenoid valve and check for debris or scale preventing closure. Clean and reassemble.
  • 2. Check valve seat: If the seat is worn or damaged, replace the valve assembly.
  • 3. Test coil: Ensure the solenoid is not being energized continuously by a shorted coil or control output. With power off, the valve should be closed.
  • 4. Control board: If the valve remains energized when it should not, the control board output may be stuck and require replacement.
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Repair Difficulty

Hard 4/5

Required Part

Fill Solenoid Valve
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