Carolina, which could have clinched home ice in the Eastern Conference First Round with a victory, remained one point ahead of the second-place New Jersey Devils. The Hurricanes are two points ahead of the third-place New York Rangers, who lost 3-2 in a shootout to the Buffalo Sabres on Monday.
Carolina and New Jersey each have two games remaining; New York has one.
"I had to juggle the lines, I had to change the power play because we had guys out there that were doing nothing, I mean, if we're just being honest," Hurricanes coach Rod Brind'Amour said. "We're going to have to call it the way it is. And some of these guys that we count on, have to start being threats when they're out there."
Martin Necas had two assists, and Frederik Andersen made 29 saves for Carolina (50-21-9), which has been outscored 10-5 in three straight losses.
"At this point, we should be really dialed in, and I feel like we didn't really play the way we want to play," Necas said. "We've still got two games to figure it out."
Claude Giroux had two goals and an assist to reach 1,001 NHL points,
Tim Stutzle
had a goal and an assist, and Mads Sogaard made 27 saves for Ottawa (39-35-7), which has won its past two games.
"Getting [Giroux] to 1,000 in the first [period], but then the fact that Carolina needs the points makes the game so much better," Senators coach D.J. Smith said.