If you woke up to find that your gas furnace is not starting or it's starting intermittently (on and then off right away) then you know your home can get pretty cold pretty quickly. Before you call a heating or furnace repair company you may want to take a look at your furnace to see if you can fix it yourself. Modern gas furnaces have a "flame sensor" in them to detect if the gas has been lit or not. If this sensor gets dirty (and they almost always do over time) then your furnace will try to light, think that gas is flowing without a flame and then immediately shut itself off as a safety feature. The fix is pretty simple: you just need to clean or scratch up the flame sensor a little bit so that it's working properly.
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