i have just been in my caravan to check everything works as i am hoping to go off in it in 3 weeks and the electric flush isn't working, usually when the blue button on top of the tank is pressed you can hear the pump, but you can't hear anything and no water is coming out the flush, will the freezing weather have caused this? is the 12volt system on one of the blade fuses in the fuse box? the caravan is a abbey vogue gts 215 2002, any ideas what it can be??? regards mark