The pump options caught me out when I bought my Coacman VIP 575/4 back in 2016. This has the impeller pump in the header tank. I was messing with the settings in the menus on the Alde control panel and ended up with no heating at all after selecting the wrong pump. My thinking was that I haven’t got an “optional” pump so, I selected the 12v inline pump which as Buckman states is for the pump attached to the boiler itself, which I have subsequently fitted to get rid of the noisy impeller pump. I ended up taking my caravan back to the dealer because I thought the boiler was faulty but, in fact if you have the impeller in the header tank, then “optional” pump should be selected.
Something else that caught me out was the selection of the temperature sensor for the heating. I had three menu options, “panel”, “lounge” and “bed”. When I selected “bed” the temperature just soared and I had to turn it down manually on the Alde control panel. There are in fact only two temperature sensors in the caravan, one in the Alde control panel itself and the other is located in the caravan control panel casing above the door. So, when I selected “bed” the system was waiting for a signal from a nonexistent sensor. The “panel” sensor in my humble opinion is nigh on useless too due to its location, in my caravan, above the worktop where I place my TV above the fridge. Both the fridge and TV produce heat which affects the temperature sensor in the panel leading to a cold caravan.