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What is the brand and model of your furnace?
It's on the rating tag inside the burner compartment
Ok, 3 flashes is a draft pressure switch not closing fault. If you have a faulty pressure switch it should be under warranty but there are other possible causes for this error like a blocked exhaust vent or intake. If the vent doesn't terminate on the roof you could check to be sure it's not blocked.
I'm sorry I didn't get from your original post that the exhaust fan wasn't running. Yes it should be under warranty if it's a failure due to a defect and not due to insects or rodents building a nest in the exhaust which got sucked into the fan.