Senators\' Mike Fisher, left, Daniel Alfredsson, center and Peter Schaefer, right, celebrate Fisher\'s goal, with Hurricanes goalie John Grahame (47) nearby. (AP Photo/Karl DeBlaker)
Mike Fisher had a goal and an assist, and Christoph Schubert, Patrick Eaves and Chris Neal also scored for the Senators, who have won five of six. Gerber, in his only season with Carolina, set the franchise record with 38 victories in 2005-06 before he was supplanted in the playoffs by Cam Ward, who won the Conn Smythe Trophy and led Carolina to its first Stanley Cup.
Gerber, who signed a three-year, US$11.1 million deal with Ottawa in the offseason, made his first appearance at the RBC Center a success by stopping the final 28 shots he faced.
Andrew Ladd scored for the Hurricanes, who have lost three of four.
John Grahame, making his third straight start and first with Carolina at the RBC Center, stopped 32 shots but was under siege throughout.
Schubert put Ottawa up 2-1 4 minutes into the second period when he took Jason Spezza's drop pass just inside the blue line and beat Grahame with a slap shot.
Then, midway through the period, the Senators turned a Carolina miscue into a 3-1 lead. Fisher scored on a 2-on-2 break which started with Peter Schaefer's takeaway from Bret Hedican in the neutral zone.
Neal scored a power-play goal midway through the second after another giveaway by the Hurricanes, using his stick to redirect Dany Heatley's shot from the slot moments after Grahame and defenseman Tim Gleason lost control of the puck near the goal line.
Ladd gave the Hurricanes a lead in the opening moments when he snapped a shot past a diving Gerber at 2:30. Ottawa tied it about 3 minutes later when Eaves tapped a rebound past Grahame.
Notes: Heatley now has eight goals and 12 assists in 18 career games versus Carolina. Teammate Daniel Alfredsson has recorded a point in 12 of his last 13 games against the Hurricanes. ... Ottawa C Jason Spezza has points in three straight games. ... Carolina LW Erik Cole played in his 300th game.