Trae XE78 furnace issue

[parbs]

I have a Trane XE78 model TDD080C936A that does not ignite on the first attempt. When the furnace gets a signal to light, the igniter glows, the furnace ignites for about two seconds and goes out. After sixty seconds it repeats and the burner ignites with no issues. This happens each time the furnace attempts to start. During the process, the controller flashes in normal mode. No two, three or four flashes. The light is a steady repeating rate throughout the entire running process. The furnace has been cleaned and burns checked out ok. Flame sensor has also been replaced. Any suggestions would be very appreciated. Thanks

[hvacwiz]

The circuirt board itself may not be sensing the flame from your flame sensor.

[parbs]

Flame sensor

I don't feel this is the case. The furnace always lights on the second attempt.