Bunn digital brewer shows E05; the brew cycle may abort or not start, often associated with flow meter issues on models with volume-based brewing.

Safety: Unplug the brewer and shut off the water supply before opening the water path.

Steps:

• 1. Identify flow meter: On Bunn brewers with programmable volumes (e.g., Infusion, ICB, some home digital models), the flow meter is typically a small plastic device in-line with the cold water inlet, featuring two or three wires.
• 2. Inspect for leaks and kinks: Check the tubing to and from the flow meter for kinks, pinches, or leaks that could affect flow.
• 3. Clean or replace: Remove the flow meter and inspect it for mineral buildup or debris. Rinse with warm water and, if needed, soak it in a descaling solution. Do not use sharp tools inside the meter. If the impeller is seized or damaged, replace the flow meter.
• 4. Check wiring: Verify that the harness from the flow meter to the control board is intact and firmly connected. Look for broken wires at the strain relief points.
• 5. Test signal (advanced): With the unit powered and the water supply on, a technician can monitor the flow meter output with a meter or scope while water flows. A lack of pulses indicates a failed meter or wiring.

Note: After service, run a few test brews to confirm accurate volume and ensure that E05 does not reappear.