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Simple test is to swap the black 15A self resetting fuse with a regular blue 15A fuse.
Next.
You are going to need to take the cover off the furnace and check the "RESET" switch.
Cyle it off then on. You can accomplish the same thing by pulling the fuse and putting it back in (reset) but in this case you want to verify the switch hasn't tripped.
While you have the cover off, look for water intrusion on the circuit board and under it. Mine was intermittent. I discovered water on and under the board and evidence of previous water intrusion. I thought I had a good seal and good Caulk around the panel.
If you have a multimeter download the furnace manual from the files section and follow the troubleshooting chart.
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