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Truma combi blown air heating

Evening everyone,
After a recent very cold trip to Wales, I decided that I better do some investigation into the blown air heating system in our 2005 Swift caravan.
While we were away, we need the heating on, but found the blown air to be blowing round cold air.
We used the electric space saver heating set to 2000 and the thermostat set to 9, heat came out from the fire nice and warm, but not the blown air.
With the caravan at home I took a look into what maybe happening.
The heat output from the elements heated up to 70 degrees, and the fan worked in manual and auto when switched on.
Next I took the fan housing off, the fan rotates, but found that it is in a housing.
So can't find anything wrong electronically or mechanical, so is the just a poor design? As cannot see how the hot air gets into the fan assembly effectively.
Any advice appreciated
 

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