Broadway Vehicle battery not charging on EHU

We have a Broadway EK 2015 with EC328 which does not appear to be charging the vehicle battery on EHU.
Any advice welcomed.

Many thanks Peter. Never knew that! 
Thought both batteries charged automatically. 
North Herts - so where do you get your wagon serviced/habitation check done?

Thanks Peter.
Yes had 30w but upgraded to 100w.
When not in use it is parked with tree shade. On drive with EHU at present but covered in snow! 

With EC328 the control panel must be on as well as switching to vehicle battery in order for vehicle battery to charge otherwise it will be leisure battery which charges

I'd never seen that documented before, but I can confirm that the light stays on for the battery select switch (indicating the vehicle battery is selected) in the circumstances you describe, even though the panel is off. What I don't know is whether that actually results in the vehicle battery being the one charged. I don't know, because I've never checked!

On mine (which is a Celex, not an A/S model) you don't even need to start the engine - just turning the ignition on and off again will trigger the disabling of the panel, leaving the battery select unchanged.

If it warms up a bit later today, I'll maybe go out and check what it actually does.

Having said that, I don't ~think~ the background drain when the panel is on is anything like as high as with the later controllers. From memory, I think it's a few tens of milliamps, while with a EC500 or EC700 it is a lot higher (maybe ten times higher?).

Yes Peter, I did post that some years ago. I think that on my van the D signal from the alternator provides the trigger for switching off the control panel and habitation electrics. I don't think it works just with the ignition on -; the engine needs to run for a moment. I didn't mention it earlier because I don't bother these days.
You can check which battery is being charged very easily. Immediately on starting charge that battery will show 14.4V on the panel, dropping to around 13.8V after an hour or two and finally down to about 13.3V.  The other battery will be at most 12.9V and probably less - unless you have just swapped from.chsrging the other. The 14.4 is the giveaway though.