Repairs to the Ben-my-Chree today could take up to six hours.
Services to and from Heysham this morning and this afternoon were cancelled earlier due to technical issues with the stern door on the craft.
However, the Steam Packet Company anticipates the vessel should be ready for the 7.45pm voyage to the Lancashire port this evening.
Passengers are being given the option to transfer to the Manannan.
Social media flooded with complaints about public toilets
Air ambulance charity makes desperate appeal for another helicopter
Fire crews spent hours dealing with serious floods earlier
Yellow weather warning to run until Thursday
Focusing on crash blackspots is outdated, says minister
Minister hopes to improve bus wheelchair and scooter access
Michael Dunlop gets his MBE from the King
More fibre telegraph poles for Ramsey?