I have a few electric wall heaters in my bathroom and laundry room made by Intertherm. They may be 30 years old. When you turn the dial to high, it takes 10 minutes or more before it actually turns on. Is the thermostat working correctly? If not, is there a fix?
Update: fixed from Nutone to Intertherm. Also, they seem to shut off pretty quickly after they start up, and then they stay off.