Landlord allowed to visit property for repairs?

[Sour cream & oiion]

I live in Cork and own properties in Dublin. One of my tenant has just let me know that her cold water to all bathrooms has stopped working. I do all general repair and maintenance work myself unless professionals are required by law. Does anyone know for sure if I (a landlord) am allowed to travel to my rented property to inspect & repair a plumbing problem for my tenant? I'm assuming I can.