The mat is not hot when I touch it on high heat, is something wrong?
The mat should not be hot to touch unless you cover it with a thick blanket. Amethyst stones radiate heat, and the surface remains warm, so it is normal for someone not to feel the heat just by touching the surface. When you lay on the preheated mat, you will start feeling the heating energy.
It is necessary that you cover the mat completely while preheating it. If you cover the mat partially, the temperature sensors positioned in the different layers of the mat around all the surfaces will report different and controversial measurements to the central controller. Finally, the controller may lose calibration and start to work incorrectly or malfunction. So, please, always cover the mat entirely while it is preheating to set level.
Of course, never cover the mat with non-permeable to infrared rays solid objects, rubber mats, camp or yoga mats, or foam toppers. It will cause constant overheat protection bimetal switches, which will finally fail, and the risk of an overheat, or even fire will become severe.
Please, check our blog article about this subject and rest assured that all mats are factory tested to reach maximum temperature.