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Understanding Your Furnace’s Limit Control Switch

The limit control switch is an important part of your furnace’s blower system, whose job it is to distribute warm air throughout your home. Yet few homeowners understand the precise role played by the limit control switch. if you would like to improve your knowledge of furnace components, read on. Here you will learn about the job of the control switch, as well as common problems it faces.  Blower Operation Understood at its most simple, the limit control switch turns the blower fan off and on. It knows when to do this thanks to a special built-in thermostat. This thermostat is responsible for monitoring the temperature inside of the furnace. When it detects heat being given off from combustion, it sends a signal to the limit control switch, which in turns starts up the blower fan.  Safety Switch The limit control switch also has another important duty: acting as a shutoff...

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The Role Of The Thermocouple In A Residential Furnace

Despite being a relatively simple home appliance, the furnace remains a source of mystery to many homeowners. Unfortunately, this often leads to the need for furnace repairs that could have been avoided through some basic education. If you would like to learn more about the inner workings of your furnace, read on. This article will discuss the job played by the component known as the thermocouple. The Basic Picture The thermocouple lies at the heart of your furnace’s built-in safety system. Its job is quite simple: cutting off the flow of gas in the event that the pilot light happens to go out. If the gas were allowed to keep flowing, it would soon reach poisonous--and potentially explosive--levels inside of your house. Mechanical Explanation  In order to do its job, the thermocouple uses the heat from the pilot light. This heat causes two strips of metal located near the tip of...

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