Bunn coffee tastes bitter or over-extracted.

Safety: Use caution when measuring hot water temperature.

Steps:

• 1. Adjust grind and dose: Use a slightly coarser grind and ensure you are not over-dosing coffee relative to water volume.
• 2. Verify sprayhead: Ensure the correct sprayhead is installed and not partially blocked, which can slow flow and increase contact time.
• 3. Check brew temperature: Measure water temperature at the sprayhead. If it is consistently above Bunn's spec, the thermostat or temperature sensor may be out of calibration and require replacement.
• 4. Descale brewer: Heavy scale can alter heat transfer and flow characteristics. Perform a full descale to restore normal operation.