The 13-metre vessel was fishing for whelk when a rope fouled its propeller and it was unable to make any headway.
The lifeboat reached the casualty at noon and the fishing vessel was taken in tow back to Wicklow Harbour, where a diver was waiting to clear the rope fouled propeller.
Speaking after the callout, Wicklow RNLI coxswain Nick Keogh said: "We located the fishing vessel with three crew about four miles north of the South Codling Buoy.
"Conditions in the area were good with sea state calm and a north westerly wind Force 3."
The crew on the callout were coxswain Nick Keogh, mechanic Brendan Copeland and crew Ciaran Doyle, Carol Flahive, Brendan Kavanagh, Tommy Murphy, Graham Fitzgerald and John Vize.