Electrical – LED strips: Red lights can’t be controlled

1. Confirm your wall switch is good. Bad switches can be intermittent.
2. Turn off the switch and take the tubes back out and put them back in making sure they're fully snapped in. It's worth a try. Don't go buy more, but if you have other new tubes try them.
3. If the lights work for a period of time and go out on their own, that usually indicates an over-heating ballast - replace the ballast.
4. Otherwise, the best test for a ballast is just what you did, try new tubes. If no luck, replace the ballast.
5. While replacing the ballast, make sure all of the wires in the sockets are well connected. Give them each a little tug. If you can't get a wire to stay in a socket replace the socket, maybe replace all 4.
6. Fluorescent lights need to be grounded to work properly. Make sure a ground wire is attached to the fixture. I've seen fluorescent lights, especially in old homes, where the people say they're always replacing tubes, and it's because the fixture isn't grounded.
7. If you're going to replace the ballast or the entire fixture consider going with an electronic ballast maybe even T8 size tubes. Amazon sells the smaller clips you'd need for a retrofit to T8 U-Bent tubes - ASIN B00A3WGR0W.

Virtually all new dimmer switches are "smart" switches. They contain tiny computer chips that control the dimming functions, and most smart switches have internal "parameters" that can be set with values to define things like minimum and maximum brightness, dimming speed, brightness step levels, etc. These switches often allow the user to change the parameters by holding the switch buttons down and tapping or clicking following a certain pattern.

For some reason I've found that certain people have a knack for messing up these switches - perhaps someone is holding down the dimmer button instead of clicking the paddle. It's incomprehensible to me how they manage to stumble into the pattern to mess up the parameters. And it's pretty much impossible to guess how to undo the damage without proper documentation. You'll need to read the manual for your specific switches to understand the different parameters and settings, and how to restore them.

You may find it easier to perform a "factory reset" on the switches, but be warned this could cause a home automation controller to forget the configuration for the switch. Then you'll find your lighting problems have suddenly become computer problems, and that's even less fun.

If they are part of a home automation system like Z-Wave or Iris, the parameters can be easily set and reset by the installer using the system controller and a computer.

As you read through the manual, look to see there is a parameter like "disable changing parameters from the switch". If so, I recommend setting it to avoid accidental repeats of this problem in the future.