Gas furnaces are among the most common home heating systems in the country. They’re relatively cheap, versatile, and widespread enough that almost every HVAC company is capable of servicing them. If you’re one of the many homeowners who owns a gas furnace, it pays to know some of the common repair needs that it can experience.
Let’s examine the top 3 gas furnace repairs.
Broken Pilot Light
Standing pilot lights have a terrible reputation for wasting energy and going out frequently. This is often because pilot lights have little or no protection from air currents in the home. This is usually easily fixed; most furnaces have an ignition button that re-lights the pilot light. In some cases, however, the pilot light may refuse to stay lit.
In older furnaces, the pilot light is controlled by a part called the “thermocouple.” This part is basically a composite metal wire, with one end installed near the pilot burner and the other wired into the gas valve. When the pilot light is turned on, the thermocouple senses the heat and produces an electrical current that keeps the gas valve open. When the pilot light goes out, the gas valve closes to keep your home from filling up with gas.
When the thermocouple goes bad, however, it closes the gas valve while the pilot light is still lit. This smothers the flame. A pilot light that keeps going out may have a bad thermocouple.
The burners are the parts of the furnace that actually combust the gas to create heat. As gas furnaces are an incomplete combustion system, there are byproducts of the process like toxic gases and leftover carbon. Most of these byproducts are vented out of the house, but carbon can collect on the burners instead. Dirty burners can have difficulty starting, or even burn at a lower intensity, leading to heating problems in the home.
Cracked Heat Exchanger
The heat exchanger is responsible for both heating the air and getting rid of toxic combustion byproducts. Over time, the constant expansion and contraction from the heat can cause the heat exchanger to crack, letting the combustion gases mix with the air being circulated. Because of the health risks involved, a cracked heat exchanger should be replaced as soon as possible.
If you need to schedule repair service for your furnace in the Merced area, call Ace Air Conditioning. We provide fast and reliable heating services.