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Hello, I need the full model number of the furnace, not just a series number
The situation with error code, is that they are quite valuable about 50% of the time, the rest of the time they can be too vague or simply in error due to a bad printed circuit board... accordingly I do not rely on them.
Are you talking about heating the condensate trap drain inside the furnace?
Heat cable is not a bad idea.
also along the full length of the condensate drain line if it is located an unheated area.
A dirty flame sensor is the 90% cause of the burners going out after 10 seconds, its a 3 inch long stainless steel rod poking into the fire box, all you can see from the outside is a white ceramic piece with ONE wire attached that runs to the printed circuit board... remove the rod and clean it off with a scotch brite pot scubber pad
If that fails do a heat stress test on the printed circuit card, warm it up with a hair drier to 125F, slowly and gently, if you get any change in behavior, good or bad, the board has micro cracks in it and must be replaced.
I am off to bed shortly, if I miss you tonight i will pick up your response first thing in the morning.