It can cause problems if it doesn't work correctly. To test the thermostat in a drip coffee maker: Step 1: Unplug the unit, empty excess water from the reservoir, turn the unit over, and remove the base. ... Step 3: If defective, remove and replace the thermostat with one of the same rating.
https://home.howstuffworks.com/how-to-repair-small-appliances3.htm
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