The Douglas councillor says a change in culture has prompted his resignation.
His resignation as chair also means he will no longer sit on the executive committee.
Mr Pitts has served the board for more than 10 years, so what has changed?
Councillor Andrew Bentley succeeds Mr Pitts as chair.
Watch film about Island mine defuser in Ukraine
A Manx man who defuses landmines in Ukraine is the focus of a new online documentary.
Card game features Island's feathered menaces!
There's a chance to fight seagulls for chips this Christmas - and you don't have to go to Peel beach!
Airport passenger figures up by one per cent
Ronaldsway airport says the number of passengers using the airport is up almost one per cent this year.
Huge drop in safety incidents at hospital
Safety incidents at Noble's Hospital have fallen by almost a third in just 12 months, according to the Island's health minister.
£14 million owed in student loans, says government
The Department of Education, Sport and Culture says more than £14 million is owed to the government in outstanding student loans.
£250k needed for Onchan street lights
Onchan commissioners say they want to borrow £250,000 to improve street lighting in the village.
Island homebuilder could be wound up
A court hearing next month will decide the fate of one of the Island's biggest developers.
Yellow weather warning issued for Sunday
The Met Office has issued a yellow weather warning for Sunday.
