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There are usually instructions on how to do this on the inside of the access door. But, turning on the gas and waving an open flame around doesn't sound like the best plan of action to me.
I've only had experience with oil fueled furnaces. If that's what your furnace is, the usual problem I run into is air in the fuel line. It simply means you have to bleed the line a bit by opening a valve and letting some fuel run through for a while, and then it will be able to light itself.
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