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No heat for multipurpose room, twining units, both are in the attic, found one unit cycling on and off on low power coming in, by passed twining control and starts fine, went and check other unit found no power to unit, getting 115 and transformer reducing power to 24 volt, but board not responding check and touch wires, and unit came on, inspect back side of board and seen black marks recommended replacing board quoted for repairs customer ok repairs installed new oem control board and add 3 amp fuse after repair cycle and test both units performed combustion test on both units ok co 25 and 21