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What you're describing sounds like an open limit circuit. This happens when the furnace overheats (there are several possible reasons).
One of these reasons is a dirty filter
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Before you change the filter watch the flashing light and note the number of long and short flashes before the pattern repeats.
Check it again. There is no 41 code. A 13 code 1 short 3 long would line up with an open limit.
What happens when it shuts down? does the blower keep running? what is the flash sequence whne it shuts down?
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