Bunn coffee maker does not keep water hot; ready light never comes on or cycles off quickly.

Safety: Unplug the brewer and allow it to cool before testing heater circuits.

Steps:

• 1. Check ready indicator: If the ready light never comes on, suspect a heating issue. If it cycles rapidly, the thermostat may be misreading.
• 2. Test heater element: Measure resistance across the tank heater. An open circuit indicates a failed heater.
• 3. Inspect and reset high-limit: Locate the high-limit thermostat on the tank and reset if tripped. Replace if it will not reset or is open.
• 4. Test thermostat: On models with a mechanical thermostat, test for continuity when cold and verify it opens at the correct temperature (requires heating and monitoring). Replace if stuck open or closed.
• 5. Control board: If heater and thermostats test good but the heater never energizes, the control board relay or logic may be faulty and require replacement.