The Steam Packet company says it's working to fix an engine problem, a week after the Manannan returned from her winter overhaul.
A control system for one of its main engines developed a problem on Saturday, forcing the engine to be shut down.
The company says it's carrying out testing and fault-finding but the vessel will operate on three engines, meaning longer crossing times, until the problem is fixed.
In a statement, the company has apologised to passengers.
Braddan commissioners recruiting new top officer
One of the Island's largest local authorities is looking for a new clerk.
School meals meat bought locally, but may not be Manx
The government says although it buys meat for school meals locally, it can't guarantee it's Manx.
Manx Care staff suspensions cost £110,000, says minister
Health and Social Care Minister Claire Christian says 15 members of Manx Care staff have been suspended in the last four years, at a cost of around £110,000.
Commissioners worried about speed cameras on new 20mph signs
Could new 20mph sign poles be used to mount speed cameras in future?
Formula One Classic TT cancelled
MGP organisers say Friday's race schedule has been tweaked after delays to today's action on the Mountain Course.
Course due to close at 6pm, say police
Police say roads around the Mountain Course are due to close at 6pm for racing.
How can historic buildings be more eco-friendly?
How can historic buildings contribute towards net zero emissions?
Racing delayed again, with schedule update "imminent"
Race organisers say there's a further delay to today's racing.
