My friend Matt at Matt's Electrical reminds us to check those GFCI outlets once ever month or two.
The whats? You know the outlets in your kitchen and baths that have "test" and "reset" buttons. We are supposed to actually push the test button once in a while and make sure they outlets pop off. Plus something in. Hit test. With the item you plugged in turn on? If not, then hit reset. It should come on now.
If test doesn't kill the power to the outlet or reset doesn't turn it back on, the GFCI is bad and should be replaced.
Easy enough to add to the air filter and check smoke detector batteries "to do" list each month.