Display shows ERR2 and the coffee maker will not heat or brew.

Safety first: Unplug the coffee maker and allow at least 30 minutes for the heating plate and internal boiler to cool.

Basic user checks:

• Power cycle: Unplug for 5–10 minutes, then plug back in and try a brew cycle. Transient sensor errors can sometimes clear.
• Check for overheating signs: Smell for burnt odors and inspect the warming plate surface for discoloration or blistering. If present, discontinue use.
• Clean the base vents: If your KitchenAid model has ventilation slots under or behind the unit, vacuum or brush away dust to improve cooling.

Advanced checks (for experienced DIYers only):

• Remove the bottom cover (after unplugging) to access the thermistor/temperature sensor attached to the heating element or boiler tube.
• Inspect the small sensor and its wiring harness for burns, cracks, or broken insulation.
• Use a multimeter to check continuity of the thermistor and thermal fuse (refer to a service manual for expected resistance values).

If the thermistor or thermal fuse is open or damaged: Replace the temperature sensor/thermistor assembly or thermal cutoff fuse. If the new sensor does not clear ERR2, the main control board may be defective and should be replaced or serviced by a technician.