Quote Originally Posted by ScottS View Post
There is one issue I have had when running CHE's on a thermostat in the proportional mode. The constant on and off pulsing of current tends to cause corrosion on the contacts of the CHE. This could be your problem.
I'll check it the next time I see it cut out...I was surprised to see it's actually heating as it should be right now. I unscrewed and reseated the CHE in the lamp earlier today before posting this and didn't see anything wrong, but maybe that helped with the contacts if that is indeed the issue.