That is strange!
I've got my L5, but haven't hooked it up yet (Still using my old Arazbao heater),.. so I only know what I've learned putting one in for my dad and for a friend,...
from what I've heard so far, I suspect the overheat sensor is a bit more sensitive than the one on my heater.
If its a good temp close to minimum, leave it there and save gas!!!

My current heater is more powerful, but I hardly ever turn it above its minimum heat.