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BOARD FAIL??

I HAVE A LOCHINVAR KBN 080 AND THE DISPLAY SCREEN WAS LIT AND THE BOILER NOT RUNNING, SWITCHED POWER OFF AND WHEN TURED BACK ON SCREEN BACK LIT WITH NO TEXT! FUSES ALL GOOD CHECKED 4 TOTAL CHECKED TRAP FOR CONDINSATE AND AIR PLENUM ALL GOOD. ALSO CHECKED FLAME ROD AND SPARK IGNITOR HAS ANY ONE SEEN THIS BEFORE AND AM I ON THE RIGHT TRACK. BOARD MODEL# RLY-2200
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