We experienced a power outage that lasted no more than 3 secs. Nevertheless, it was enough for our tankless water heater unit to stop working. The power light was blinking red. I turned back on the power only to hear the unit warm itself up, stop, and then more power light blinking. I noticed the LCD screen had numbers on it. Online research showed they were an error code for abnormal air pressure. Color me surprised! I had no idea that air was necessary to heat water up with these units. There could be an obstruction in the venting pipe or something else. Instead of calling somebody over to look at it, I watched a YouTube clip on how to open these units and check the filter. Again, new info for me. I had no idea these things had a filter to begin with. Anyway, it was gross and completely clogged. After I cleaned and dried it, it looked like the grill it was supposed to be. Once that was done, the unit powered on normally and we finally had hot water, again. Next up, we've had a dimmer downstairs that was installed by pros which would buzz constantly unless it was at the max setting. I was bored and read that it could be because the load would be too much for the dimmer. Prior to that, I just thought a dimmer was a dimmer, but not so. Anyway, after I turned off the circuit, I was able to open the box and see that the dimmer was 100 watts short of the proper load. Off to Home Depot. A unit 200 watts over the necessary should suffice, just to be on the safe side. Some manufacturer's numbers can oftentimes be rather enthusiastic (i.e. best-case scenario). Took my time and read the instructions carefully. Tada! No more buzzing! Kind of surreal to not hear that high-pitch whining when the lights are dimmed but it's sooooo much nicer, now. It can be challenging, especially since I'm as far removed from being handy as possible but I try what I consider to be tasks that are attainable for my very limited skills. It can be rewarding. One thing's for sure. You're never bored!