Eberspacher heater control

[extravert]

I have a thermostat controlled Eberspacher diesel heater on board. It is thermostat controlled, with a rotary knob with 0, 1, 2, 3 and 4 on it, and a green light in the centre of the knob. The instructions tell me about positions 0 to 4, but if I turn the knob back from the 0 position there is another click-stop, where the green light comes on again. I haven't figured out what this position does, and nothing is mentioned in the instructions. Anyone any idea? (I've already looked at their website).

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[Col]

Possibly "Vent" position. Some Eberspachers have this. It is basically to supply cool air ( fan works, but burner off )

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[petery]

I believe 'Col' is correct. I have the same kind of Eberspacher unit - originally designed for vehicle use - heating recirculated air (ie not fresh from outside the cab(in) and the switch position just circulates the air withiut heating.

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