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That can be from any number of things. Has this been sitting any length of time? If so, fire up a stove top burner and let the pressure equalize and then try the furnace again. Try it up to 4 times and see if the unit starts. Let me know if it doesn't and we can go from there.
Just wondering if you perhaps missed my previous response to your question? If you still need some input from me and assistance in resolving this, please get back to me here. Thanks.