Thermocouples / Flame Sensors
Your boiler’s flame sensor is your boiler’s main indicator that a fire is burning when the gas is on. On standing pilot boilers the thermocouple is located near your pilot light to verify the pilot is on. With electronic ignition, a flame sensor is used to ensure you that your boiler is working properly. These are subject to corrosion and dirt buildup that will affect their performance. When working with thermocouples and flame sensors, it is critical these are clean and functioning properly to prevent avoidable no-heat situations. These items should be checked, cleaned and tested once per year.