The school at Holmfield, Halifax, is open as normal today.
Yesterday an overheated light fitting resulted in a sprinkler system causing water damage to the premises.
Halifax and Illingworth firefighters were called shortly after 1 pm.
The small fire started in a science lab and the water seeped through a floor into other areas.
Crews helped with the clean-up operation.
The school said damage was minimal and there is no disruption to any lessons as all teaching rooms were not affected.