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How long is the new gas line to the heater? Is it propane or natural gas.
How long has the manual gas cock been open?
Tell me which color wires run from the thermostat to the printed circuit board inside the furnace and what terminals each wire lands on.
I need the brand and model number of the thermostat.
We can go from there.
Nothing other than a factory defect would cause that in my view, but I do not have the manual in my files to confirm that. This is not an answer, I will opt out so that other of our experts here might have the manual or can confirm... good luck with it.
It is fgoing into lockout due to failing to light after a specific number of times