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.
Postal vote applications have to be in soon
Living far away but want to cast your vote in September's election? Time's running out!
Mum launches petition over university support
A petition's been launched calling on government to provide more support for Manx university students.
Bus services north and south face disruption later
Bus Vannin says a number of its services may face disruption this evening.
Wildlife Trust unveils woodland plans
The Manx Wildlife Trust has submitted a planning application for a new woodland in the northeast of the Island.
Deadline looms for by-election nominations
Time's running out to get your forms filled in if you'd like to stand as a commissioner in Marown.
Biker in UK hospital after Mountain crash
Police are appealing for witnesses to come forward after a crash on the Mountain Road yesterday afternoon.
Trial event closes roads in Peel and Ramsey
There'll be road restrictions in Peel and Ramsey during a motorsport event this weekend.
Requisition meeting for Garff voters
A requisition meeting will be held in Maughold next month.
