Two of the wires are low voltage and go to the limit switch and two wires are line voltage and go to the fan switch.
Furnace fan limit control switch replacement.
Fan control limit switch the fan switch reads the temperature inside a furnace and once the temperature becomes warm enough turns the blower motor on sending warm air into a home.
This is used so that cold air is not blown into a house waiting for the gas flames to heat up enough before the blower turns on.
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The limit switch is a safety switch that monitors t.
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In this episode of repair and replace vance shows how to replace the high limit switch in a gas furnace.
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The switch is mounted on the furnace air plenum and is easily recognized because of its wiring once the access panel has been removed.