Oster Stuck Relay / Shorted Warming Plate Circuit

Warming plate stays on continuously or overheats, even when the coffee maker 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

Stuck relay on control board, Shorted thermostat contacts, Miswired warming plate, Control board logic failure

How to Fix / Troubleshooting

Safety first: Unplug the coffee maker immediately. Do not leave it plugged in if the warming plate heats while the unit is off.

Confirm behavior:

  • With the unit unplugged and cool, plug it in without pressing any buttons. If the warming plate begins to heat, there is a serious control fault.

Internal inspection (advanced):

  • Inspect the control board for a stuck or burnt relay controlling the warming plate.
  • Check the thermostat for welded contacts.

In most cases, the control board or warming plate thermostat must be replaced. Because of fire risk, consider replacing the entire coffee maker if parts are not readily available.

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Repair Difficulty

Professional Required 5/5

Required Part

Warming Plate Thermostat
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