Most types of residential furnaces feature an internal component known as a blower switch that is used to shut down the fan motor in the event that the appliance overheats the motor malfunctions or the furnace filter becomes clogged. However if your furnace is poorly maintained experiencing operational problems or reaching the end of its operating life it can encounter some safety issues that can be of serious concern. If the condensate drain pipe becomes plugged the furnace may detect a buildup of condensate in the secondary portion of the heat exchanger drain box and actuate a pressure switch that disables the furnace for safety.
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