Unit under a year old, fuel pump replaced twice and motor that controls it replaced once. Fuel filter and housing clean, no sludge. After all replacements, unit worked OK for a week or so, then shut down and had to be manually reset. Last reset on 12-29-15, required what they called a hard reset. Technician unable to figure out what the problem is, just keeps replacing same parts. Colder weather is right around the corner and I don't know if furnace will work or not. This is a Carrier OBMAA060154 oil furnace, again, not even a year old. Purchased from and installed by Sears.
Thank for any insight you may have on this problem.

Tell Sears you want the unit replaced, not repaired anymore. Better yet, Go to Carrier website and complain. Use the "Contact us" tab.