Bunn
Inconsistent Brew Volume Control
Bunn coffee maker's brew volume is inconsistent; sometimes overfills, sometimes underfills the carafe.
Advertisements
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.
Advertisements
Possible Causes
Scaled flow meter (on volume-controlled models), Air in water line, Incorrect programming, Sticky brew valve
How to Fix / Troubleshooting
Safety: Unplug and shut off water supply before servicing water path components.
Steps:
- 1. Verify programming: Check the programmed brew volumes in the control menu and reprogram if necessary.
- 2. Clean flow meter: Remove and descale the flow meter to ensure the impeller spins freely.
- 3. Bleed air: Run several manual brews to purge air from the water line, especially after installation or plumbing work.
- 4. Inspect brew valve: Clean and service the brew solenoid valve so it opens and closes crisply without sticking.
Advertisements
Repair Difficulty
Medium
3/5
Advertisements