My furnace won't come on it says ignition failure

How to fix ignition failure

It may take a day or two for an expert to get online, that can help you.

It would help, if you can list the name and model of your system, and other ID information.

Would help if you told us what brand and model you have, otherwise we are just guessing. What happens when the thermostat calls for heat? Hear the inducer? Does this have spark or flat glow bar ignitor? Have you cleaned the flame sensor?