What does the ’HT’ message mean on my 3D Comfort?

The \'HT\' error message means the unit is overheating. You should unplug the unit and make sure the vents are clear of any obstruction. Please wait 10 minutes for the unit to cool down and then plug the unit back into the outlet. If the \'HT\' alarm does not clear, please contact our Customer Care Dept. for further assistance.