I have the same problem with a Hayward 400ILDL2 model; the link provided by the other poster that showed the drawing had an an ingnition board only or a panel/bezel keypad; Did you replace one or both? I'm not sure what to order.
Like yours, first year was fine, then downhill. Last year, the temp control on front would not go up or down (stayed at 82 and could not be adjusted). At last of season, would not flame up to heat. Guy who closed our pool said "probably a circuit board, for about $600 plus".
So...curious to know which you ordered, or which part number.