North Shore Hospital relocated 20 patients yesterday following a flood in their emergency department.
Water began to pour down in the ED around 11am when a sprinkler's head was inadvertently knocked by a cleaner during routine cleaning of the ceiling.
A Waitemata District Health Board spokeswoman said the bumping of the sprinkler caused the head to start releasing water, resulting in a minor flood.
The sprinkler was in a contained area and around 20 patients were immediately relocated to adjoining areas.
Takapuna Fire Service spokesman Shaun Pilgrim said the fire service responded within minutes to shut down the system and clean up the mess.