HeatingModern Safety Components Found in a Furnace

People sometimes worry over a new furnace installation, as they may have heard some unpleasant stories about furnace safety hazards in the past. Long ago, furnaces were not the safest fixture to keep in your home, risking gas leaks, fires, and even explosions. And while modern furnaces do still have the potential to be hazardous, this is only true if they are left in the wrong hands. Furnace installation, repair, and maintenance are all jobs for a skilled professional only to prevent safety hazards from endangering your home. Fortunately, modern furnaces also have a few safety measures in place, 3 of which are described below.

  1. Furnace Limit Switch: The safety components of a furnace are connected to the furnace control board in order to communicate with the unit when it is time to shut off or take alternative safety measures. The furnace limit switch is set to a specific temperature, and a sensor monitors the temperature in the plenum (where the ducts meet the furnace unit). When the temperature is too high, the gas valve closes, effectively preventing the furnace from overheating.
  2. Flame Sensor: The flame sensor is a probe that simply detects whether or not there is a flame going. Of course, you don’t want the gas running if there is no flame to burn off the fuels, as a gas leak is extremely dangerous. When no flame is detected from the burner, the gas valve is closed off for safety.
  3. Air-Pressure Switch: Modern furnaces contain a draft inducer, a component that blows any excess combustion gases from the combustion chamber to ensure that nothing is left behind. If any soot or residue were to remain in the chamber, it could make the next combustion cycle less efficient and could allow for soot to develop and block the burner. The draft inducer also helps to make sure that gases are venting properly. When the air pressure from the draft inducer drops too low, the air pressure switch shuts off the gas valve, and you’ll need a technician to come diagnose the problem.

G&S Heating, Cooling & Electrical, Inc. will make sure that any furnace installation or service is done using only the safest means possible. Give us a call to learn more about servicing your furnace in Everett.


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