One day I was going to use a couple small space heaters to put a load on the genset for exercise. It didn't work. The heaters wouldn't run on Fan, Low or High. I tried everything I could think of. The heaters would not come on. I decided it was the transfer switch, took the cover off and started looking. Dinner was soon, I left the coach and worried about all night.
I went to the hardware store and got enough spare parts to wire around the faulty transfer switch so that I could get power to the motorhome.
Then I noticed that both heaters had their thermostats turned to zero.