Due to wear of mechanical parts in the control head, the buttons on
temperature control assemblies work erratically or not at all. These
control heads need to be replaced for this concern or when the display
screen starts to fade out.
Oil feed tubes break and fall into the crankcase (engine) and the tappet becomes noisy
(ticking), resulting in degraded idle quality. Our technicians recommend
replacing all of the tubes at the same time, broken or not.