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The issue is excessive heat. Regeneration requires elevated exhaust temperatures however certain malfunctions not related to the process can elevate these temperatures beyond control. If this condition exists and an uncontrolled fuel source like a severe injector malfunction or a turbo failure that allows oil and or fuel into the exhaust, the potential for fire exists. My guess on the calibration fix would be to disable regeneration if exhaust temperatures exceed a determined temperature or a fuel system malfunction is detected, and or, lower exhaust temps by de-rating engine power while the condition(s) exist. Mind you , this is my guess, there has not been an official explanation on this that I have read as of yet.
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Ford Master Diesel Technician
Diesel Technician Society
This is one of the posts from the FTE forum and I think this guy knows his stuff.
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