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Do you get 24 volts to the gas valve when igniter comes on?
Does the light ever flash when furnace fails to light?
I furnace fails, the light should flash indicating what failed. If you can obtain a meter we can do some testing though.
I have to leave so I will open this to other experts
I see no one has assisted you yet.
We would need a meter to troubleshoot. You can get an inexpensive one at Walmart for about 15 bucks if you would like to troubleshoot and I would be happy to guide you.