Pre heater, do you mean glow-plugs or actual pre heating of engine/coolant /oil?
Haha, yes it’s up north, but we do have +20 deg C now. I found a short circuit in the sensor on one of the engines. Have ordered two new ones now....
Having a problem with fuel temp warning, shows 0 deg C at start and sets warning and alarm. On both engines. Anyone who has experienced the same...