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A limit switch is a switch that will shut off a burner at the highest temp that is allowed. Example:If the limit is set at 200 degrees, the inside of your heater will heat up to that temp, then the burner will shut off. The blower motor or circulator pump will move the air or water around your house. When the inside of your heater cools down anywhere from 15-25 degrees, the burner will come back on & the cycle repeats itself over & over until the thermostat is satisfied.
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