A pump module on a cooling loop on the International Space Station shut down Wednesday, forcing the crew to halt some noncritical systems. In a statement NASA said that the six-man crew and station was never in danger and everyone is safe.

The flight control teams suspects a flow control valve inside the pump is not functioning correctly. A repair timeline is unclear until the exact issue is pinned down.

“It could be a serious problem, but it’s not an emergency,” Johnson Space Center spokesman Kelly Humphries told the Associated Press.

The cooling loops circulate ammonia outside the station to keep equipment at a proper temperature. The pump shut down after reaching a pre-set temperature limit. Some electrical systems were shifted to the station’s other cooling loop.

The crew currently consists of two Americans, one Japanese and three Russians.