If your furnace is not igniting, the first thing that may come to mind is that your furnace may be faulty. This is not the case however, there are many different things that could be the cause of your furnace not starting. It could also be that the thermostat is defective or that the power cord is not connecting properly. There are many things that could cause the furnace to not start but in order to fix these problems you need to first determine what the problem is before you can fix it. You should know exactly what you are looking for because when trying to diagnose your furnace you will need to be able to tell exactly what your furnace is doing.
To diagnose your furnace, you will first need to turn off your furnace. Next, you will want to disconnect any cords that are attached to the furnace such as the extension cords and the power cord. Then you will want to plug in all of the wires that are connected to the furnace and then unplug the wires from the furnace. You will then want to turn off the main electricity source on the house. You will want to disconnect the main power supply so that you do not have any cords that are connected to the furnace. Then you will want to take a look at the connections on your furnace.
If the problem is that the thermostat is not working correctly, you may want to replace the thermostat on your furnace. This is actually something that will cost you around $200 depending on how much work is necessary. It is possible that the thermostat is not going to have any parts that are available for it so it will need to be replaced by someone that knows how to do this. You can find people online that are willing to replace your thermostat and this should be done as soon as possible. If your furnace is not igniting, it could be a problem with your furnace filter. If the furnace filter is full of dirt and debris, the furnace will not be able to operate properly. You will want to vacuum the filter on a regular basis to ensure that it is clear of dirt.