true, it tripped when I only had power going to One of the furnances through a old 3500 watt generator.
You CANNOT run modern furnaces from any generator w/o damaging the circuit board. Generators produce unstable hertz/hz power cycles from 58-62 and the furnace board MUST see only 60 hz power. Unless you buy an expensive power conditioner to put between the generator and furnace. Generators are meant for lights and power tools and saws that don`t require stable power.
"Cut it twice and it is still too short".