Air ducts that are damaged, cracked, or loosened, can result in air leaks and heating inefficiencies Dirty or clogged burners, can result in a loss of heat from the system A broken heat exchanger will impact your heater’s performance and can be dangerous to your health Faulty limit switch, leading to issues with the fan constantly running Malfunctioning electric ignitions, thermocouples, or pilot lights, which may lead to a loss of heating capabilities Damaged or worn-down components such as the blower belt, motor, or ball bearings, which can cause noisy operation, but can also affect the system’s fan functions and ability to circulate air as needed