I have a Fahrenheat FUH54 (5000w) heater in my shop and it has worked well for over a year. Now, it cycles on and off every minute or so, even at the highest setting. It used to stay on for hours at a stretch on the high setting.
After doing some research, it seems that the two most likely culprits are the hi-limit switch and the thermostat. I'm not opposed to replacing both but I'm wondering if there is a way to figure out which one (or neither one) is the problem. I'm also open to other ideas.
Thanks.