Display shows “ERR” and the coffee maker will not start a brew cycle.

Safety first: Unplug the coffee maker before opening any covers or touching internal components.

Step-by-step:

• Power reset: Unplug the unit for at least 5 minutes to allow the control board capacitors to discharge. Plug back in and check if the ERR clears.
• Check outlet and surge: Plug a lamp or phone charger into the same outlet to confirm proper power. Avoid using a power strip; plug directly into the wall.
• Inspect control panel connection (if accessible): Remove the top cover (usually Phillips screws under the water reservoir lip or rear housing). Carefully inspect the flat ribbon cable from the keypad/display to the main control board for looseness or corrosion. Reseat the connector fully.
• Look for burn marks: Examine the main PCB for burnt spots, swollen capacitors, or a melted relay. If present, the board must be replaced, not repaired at home.
• Factory reset (models with programming): On many Hamilton Beach programmable models, hold the BREW or PROGRAM button for 10–15 seconds while plugged in to clear minor logic errors (consult your exact model manual).

When to stop: If ERR persists after a power reset and cable reseat, the control board is likely defective and should be replaced by a qualified technician or the manufacturer’s service center.