The Irish Coast Guard says it has withdrawn the services of in-shore rescue boats for safety reasons.
This affects boats stationed at 23 locations around the coast.
It says the decision was taken following a "reported malfunction of a key piece of personal protective equipment".
The Irish Coast Guard says it is actively managing the situation.
It adds that it is liaising closely with all key stakeholders and Search and Rescue (SAR) providers.
"The Coast Guard is evaluating all options and is confident of a timely resolution of the matter", it says in a statement.