Intermittent Pilot
Modern furnaces can feature intermittent pilot or hot surface ignition. With the former type, a gas line is designed to allow gas flow when the thermostat calls for heat. There is a high voltage electrical spark that ignites to form a flame, which powers the pilot light. A furnace contains a flame sensor that tracks pilot light to see if it is functioning properly, and if it is, the main gas valve is allowed to open, causing the burners to light up. When replacing your appliance with an intermittent pilot system, a few potential challenges may arise during its lifetime. For one, the pilot gas pipe may not be correctly positioned, which is why you should consider professional furnace replacement. Another problem is that the connection to the thermostat may be faulty or loose. A dirty nozzle or defective electronic spark may also cause a lot of trouble. Read more on this article: http://bit.ly/2jOeYr4