Members of the NUT and NASUWT are striking at Worthing High School over plans to make the school an academy.
The teaching unions say that staff were not consulted about the proposal and that they do not feel it is in the best interest of pupils.
A spokesperson for the school confirmed that 16 members of staff were taking part in the strike action.
More top news
The company advised customers to "unplug" their tumble dryers and "do not use it" if they are subject to the recall.
Police have found possible evidence at the the former home of double murderer Christopher Halliwell. It's part of a major search operation.
Wednesday's weather forecast for the west of the region