Monday, Aug 10, 2015 at 21:19
Confusion indeed! Maybe due to us discussing different models of Webasto heaters. That photo of yours Mick looks (I think) the same as mine, an Air Top 2000ST. That sensor is indeed a heat sensor, but an overheat sensor. If for example you block the air inlet, the machine will overheat, the sensor will detect it and turn the machine off. It is not involved in controlling the temperature during normal operation.

Overheat Sensor
Bob, I'm not disputing what you say but we need to state what models we're discussing. Mine was fitted in 2008, and is an AirTop 2000ST.
This is what my controller looks like:

Controller
As you can see it is not just an ON/OFF switch.
In our van the controller is situated near the east-west bed at the front of the van. When not in bed we block this area off with a curtain, which is not ideal because the thermostat (in the controller) is effectively outside the area where we are sitting. Thus I intend to fit an external temperature control, which will be in our living area. This external control attaches to the main controller and then effectively become the thermostat.

External Temperature Control
This is what I was looking into when Mick submitted his post. It has only taken me 7 years to get around to it.
I hope this clears up any confusion. If not, I'm happy to be proved wrong. (It wouldn't be the first time).
Col
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