Replacing thermostat switches in coffee makers is a simple process, whether you are working with a home brewer or a large commercial unit. This guide explains the different types of thermostat switches, including snap disc and capillary, and how they are used in coffee makers. It also provides information to help you identify which replacement switch your coffee maker requires. If you are unsure which thermostat switch your coffee maker requires, contact our technical team to help you identify a direct replacement.
Types of Coffee Maker Thermostat Switches
Coffee makers typically use two thermostat switch functions:
Heating Element Control
The heating element control regulates the temperature of the coffee maker’s water and heating plate, ensuring the brewer maintains consistent brewing temperatures.
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Snap Disc Thermostat – Common in household coffee makers, featuring a fixed temperature setting and a cost-effective design.
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Capillary Thermostat – Primarily adjustable (though fixed options exist), often used in larger commercial & industrial coffee makers that require more precise temperature control.
High Limit Control
The high limit control is a safety device that shuts off power to the heating element if the coffee maker overheats. This prevents damage to the equipment and reduces the risk of fire if the brewer runs dry or the heating system fails.
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Snap Disc Thermostat – Frequently used as a safety cutoff. When used as a high-limit device, most snap disc thermostats are one-shot designs that must be replaced after tripping.
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Capillary Thermostat – Can also serve as a high-limit safety control, especially in commercial applications where adjustable settings are preferred.
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Digital Thermostat (Newer Models) – Some coffee makers now use electronic thermostats for high-limit protection instead of mechanical options.
How to Test Thermostat Switches in Coffee Makers
Safety Reminder: Always unplug the coffee maker and allow it to cool completely before working on it.
Testing Steps:
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Disconnect the coffee maker from power.
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Remove the wires from the thermostat terminals.
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Run a continuity test across the thermostat terminals.
Test Results:
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No continuity (open circuit) – The thermostat switch has tripped and needs replacement.
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Continuity present – The thermostat is still operational.
Choosing the right thermostat switch keeps your coffee maker running safely and consistently. Whether you need a fixed-setting snap disc thermostat for a home brewer or an adjustable capillary thermostat for a commercial machine, understanding the difference helps ensure a proper fit.
