Klarstein Stuck Heater Relay / Control Fault

Klarstein coffee maker’s warming plate stays hot even when the machine is turned off.

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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

Relay contacts welded closed, Shorted triac on control board, Miswired power switch, Control board firmware fault

How to Fix / Troubleshooting

Safety first: Unplug the coffee maker immediately and do not use it until repaired. This is a fire risk.

Internal diagnosis (advanced):

  • Remove the bottom or rear cover to access the main PCB.
  • Identify the warming plate relay or triac and inspect for signs of overheating or burning.
  • Test the relay contacts for continuity when the machine is off; they should be open.

Replace the main control board or the specific relay/triac if you have the skills and tools. Due to safety implications, professional repair is strongly recommended.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board / Heater Relay
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