Do you mean there is a good 230v supply to the Motorhome , or to the Truma unit ,as there is normally an separate on/off switch in the Motorhome for the 230v supply to Truma heaters.
If the 230v operation yellow light does not come on , but the green lamp on the control panel illuminates , it normally means that there is no 230v supply voltage or the overheat switch has activated ( as Bessy765 has suggested ) ) or the device fuse is defective , according to the Truma operating instructions
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