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Is anyone familiar with fault 3c/217, boiler began tripping yesterday, no other problems in 3 years. Cleaned and reset ran for a while and locked out again and will only reset and run in chimney sweep mode and will continue to run for an hour plus after exiting sweep mode. Code is not in american manual others have found it in the french manual and it says replace box controller UBA combustion or fan. Any help would be appreciated Im not too familiar with these boilers I work in the commercial side of the business and this is my home boiler.