Signaling the gas valve in your furnace to open or close, the thermocouple monitors heat generated from the pilot light flame. The following tips can help you determine if the component has developed cracks that can compromise your comfort, health and safety.
How Do Thermocouples Work?
Made up of two different metals joined together, a thermocouple generates a small voltage of electricity that allows it to trigger the furnace’s gas valve to open or close according to the sensed temperature. It’s also a safety device that protects you from exposure to deadly carbon monoxide. Positioned in the appliance’s pilot light flame, it ensures the gas valve stays shut if the pilot light goes out, preventing dangerous gas leaks.
What Causes Thermocouples to Crack?
Over time, wear and tear takes a toll on thermocouples. Accidental damage such as a sudden impact can also cause the device to crack. Here are three other reasons that these components typically break down long before a furnace needs to be replaced.
- Exposure of the essential component to extreme swings in temperature
- Degradation of the device resulting from dirt, dust and other contaminants
- Metal fatigue and weakening due to the furnace cycling on and off too frequently
Thermocouple Repairs and Replacements
A malfunctioning thermocouple can cause the pilot light to turn yellow, which is a clear sign of incomplete combustion. Should this happen, it’s imperative to schedule furnace repair immediately to prevent carbon monoxide poisoning. It’s also a good time to consider replacing an outdated furnace. Today’s energy-efficient models feature electronic ignitions that eliminate concerns about broken thermocouples.
Whether you need furnace repair or a new installation, Western Hills Heating & Air Conditioning is your premier choice for top-quality heating services. Since 1981, our family-owned company has kept families throughout Okeana, OH, and the surrounding areas warm and comfortable when outdoor temperatures take a tumble.