Gas furnaces are among the most common home heating systems in the United States. They’re relatively cheap, easy to install, and fairly easy to repair. Just like any home heating system, however, they have the occasional breakdown. Here are the three most common gas furnace repairs that you’re likely to encounter.
Pilot Light Won’t Stay Lit
The pilot light is a continuously burning flame located underneath your furnace. It is there to ignite the burners, which serve as the furnace’s heat source while it is running. As the pilot light is often unprotected, it can occasionally blow out if exposed to a draft or other strong air current. Relighting the pilot light is a fairly simple affair. The real problem occurs when your pilot light refuses to stay lit. This is usually the sign of a bad thermocouple.
The thermocouple is a sensor that is responsible for making sure that the pilot light keeps receiving gas to burn. A bad thermocouple has lost the ability to sense the heat from the pilot light, causing it to cut off the supply of gas and smother the flame.
Dirty Air Filter
Every furnace contains an air filter, designed to protect it against the dust and debris that is common in ductwork. As an air filter gets older, however, it becomes clogged with the same dust and debris that it was protecting the furnace from. A clogged air filter can restrict the flow of air to the furnace, causing heat to become trapped in the unit. This can lead to the furnace overheating, which will cause it to shut itself down rather than risk a fire.
Cracked Heat Exchanger
The heat exchanger serves two roles in the furnace. First, it is responsible for heating the air as it flows through the furnace. Second, it serves as a channel through which toxic combustion gases travel to get to the exhaust flue and out of the house. Years of wear and tear can cause the heat exchanger to develop small cracks, allowing the combustion gases and air from the house to mix. This is a major threat to health and safety, which is why a cracked heat exchanger needs to be repaired or replaced as soon as possible.
If you’re having problems with your furnace, call AZ Air Conditioning and Heating. We provide professional heating services throughout Los Angeles.