i know that Frigidaire was sending out the wrong control board in the correct box ( believe it or not it happened to me 2x ).. finally i had to call ELECTROLUX directly and had them send me the board direct to customer.. i believe that the 4 is because there is a wiring issue with one of the microswitches where the damper motor is and it will not allow the damper / control board to recognize "open" position .. if you can get me the s# i can give you better info direct from TECH ASSIST ...
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regards
jim
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