When you go to your house zone (by logging in there or going to your house from any other zone), HRA will alert you to any plugs that need repair or will need repair soon.
You can choose to have the alerts show up in an on-screen bubble, in chat, or both. You can choose whether to show only overdue repairs or to include plots which will require repairs in the near future. You can choose how long "the near future" is.
You can also disable alerts for plugs you don't care about repairing ("Cute Date Spot," I'm looking at you!).
Choose the configuration item from the system escape menu or type "/repairalerts" to see the config UI.