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picture borrowed from next post,it is possible the valve is sticking open and needs replacing.

I had one of these valves stick. Showed the same syptoms as you describe. I didn't replace it just made sure that it had shut off correctly each time I operated it and haven't had a problem since.

The white valve is the pressure switch. This shuts off the pump when the tap /taps are closed. Sometimes it can be heard "cycling" this can be down to battery voltage that isnt constant or the valve itself might need a tweak.

In our van Ranger GT60 the adjustment for this valve is as follows:

With system primed close all taps, leave power supply on, tighten adjusting screw clockwise pump should now run, partly open one cold tap to allow water to flow, slowly loosen (anticlockwise) the adjusting screw until the switch starts to click, the switch will then be properly adjusted. Close the cold tap and the pump should go off.

 I am curious as to what the white screw valve was at the side of it as well.

not sure yet will check.i thought it was an air valve to adjust pressure in the system. see

http://www.leisureshopdirect.com/caravan/home/product_5500/whale_in-line_pressure_switch.aspx

My above post relates to this valve/ switch.

I assume this is the one you are referring to.

The instructions are taken directly from my owners manual. If you are having trouble with the valve cycling or not shutting off correctly then yes mention it at your service. This should be checked as part of the service anyway. It is of course always useful to know how to adjust this because you never know when you might need to tweak this out on site. There is always a chance that the valve could be knocked or brushed against when rumaging (under the seats in my case) I occasionally have to tweak mine.

Its also worth checking that you dont have any kinked pipes going to or from the valve because this too can cause the valve to cycle or not switch the pump off correctly.