Black+Decker Unstable Power Supply / Loose Connection

Display or indicator lights flicker or dim while brewing.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Loose power cord connection, failing internal power supply on control board, high resistance connection at heater terminals, household circuit overload

How to Fix / Troubleshooting

Safety first: Unplug the unit before opening any covers.

External checks:

  • Plug the coffee maker directly into a wall outlet, not a power strip with multiple high-load devices.
  • Test the outlet with another appliance to rule out house wiring issues.

Internal checks:

  • Remove the bottom cover and inspect the power cord connections and heater terminals for looseness or discoloration.
  • Tighten any loose spade connectors and replace any burnt connectors or wires.
  • Inspect the control PCB's low-voltage power supply (transformer or switching supply) for signs of overheating.

When to replace:

  • Replace damaged wiring harness or heater terminals.
  • If the low-voltage supply is unstable, replace the main control PCB.
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Repair Difficulty

Medium 3/5

Required Part

Wiring Harness
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