The water heater was still running, but the water was coming out scalding hot and the temperature limit switch kept tripping. I assume that meant the issue wasn't a blown fuse (I don't know much about this stuff so maybe that's not true?). Based on internet research, I first checked for both heating elements to see if either or both had shorted, but everything read normal on the multimeter. Some sites recommended checking the pressure relieve valve. I haven't yet, but probably should. Yesterday I bought a universal thermostat set and replaced both the upper and lower thermostats. As of this morning, everything was okay. As soon as I get home I'm gonna check the water again.
