The Islanders’ power play has gone cold, but in the meantime, they have entered lockdown mode on their penalty kill.

The Avalanche had four minutes on the man-advantage Monday night and could not get a single shot on net as the Islanders shut them down on the kill in their 1-0 win at the Coliseum.

“That was huge,” coach Barry Trotz said. “Their power play is hitting about 36 percent in their last little while. They’ve got some dangerous weapons. They got some big bodies that go to the net, they got some guys that make plays and they got some guys that can create that one-on-one separation.

“We had commitment. When we needed a block, we got a block. When we needed to be in the lane forcing them to shoot it wide instead of getting the block, [we did].”

That got tested when Scott Mayfield went to the box for interference at 12:22 of the third period with the Islanders clinging to the 1-0 lead, but it went by without much drama.

The Islanders have now gone six straight games without allowing a goal on the penalty kill (in 13 chances), though their own power play sunk to 0-for-12 over their last seven games.

Thomas Greiss was set to draw the start in the second half of the back-to-back Tuesday against the Devils. He had alternated games with Semyon Varlamov for most of the season before Varlamov started the last five games.

“Greisser is proud, he’s a good goaltender and he’s going to want to respond,” Trotz said after Varlamov’s shutout. “He wants a piece of the net, there’s no question.”

Trotz said before the game he needs more scoring from his top-six forwards. Anders Lee scored for the first time in six games but the scoring droughts of Josh Bailey (12 games), Anthony Beauvillier (10 games) and Jordan Eberle (10 games) continued.

“This year, we’ve had some guys go dry,” Trotz said. “I think right now we got two or three guys that we need to score, [they] aren’t scoring.”

On Monday, the Islanders started a stretch of 12 games heading into and out of the All-Star break. Eight are home games, three are road games against the Rangers or Devils, and the only flight is to Carolina to face the Hurricanes on Jan. 19.

“The more rest you can get through the dog days, it should be to your advantage, no question,” Trotz said.

The Islanders’ 33 blocked shots tied a franchise record.