Or maybe a broken thermostat heater. Apparently this is a separate component sometimes. What on earth is thermostat heater, you ask? Surprisingly, many dryers

Or maybe a broken thermostat heater. Apparently this is a separate component sometimes. What on earth is thermostat heater, you ask? Surprisingly, many dryers apparently have a simple fixed-temperature thermostat, and in order to make lower settings work, a heating element tricks that thermostat into perceiving a higher temperature. If that heating element doesn't do its job, then the dryer acts like it's always on the highest setting. From https://applianceassistant.com/Dryer-Repair/How-Electric-Dryer-Parts-Work.php#thermostatHeater https://applianceassistant.com/Dryer-Repair/How-Electric-Dry... : > The thermostat heater is often located within the cycling thermostat. However, it may sometimes be a separate component mounted to the dryer's cycling thermostat. Depending on the dryer's temperature setting, more or less voltage is supplied to this heater. Low settings supply more voltage and create more heat, while medium settings supply slightly less voltage, generating less heat. High heat settings will not energize the thermostat heater at all. In this way the thermostat is tricked into thinking that the dryer is hotter than it actually is, so it opens at a lower drum temperature.