either microswitch probem or airlock in shower water feed pipe.
check if you have flow pressure switch in the sytem found usually near the water inlet under the seat set in the blue cold water pipe, it's largish and white with knurled knob on top..
close it down turning knob clockwise then open the bathroom cold tap and turn the knurled knob anti clockwise to open valve untill it starts to 'click' stop turning and check if you have water flow from tap.
also removing airlocks at pump in outside barrel [caravan club info] turn on both bathroom and kitchen cold water taps and bounce the pump up and down in the water it sometimes kicks out the air. it works i've done it in the past. another tip for free,
if you have a thetford toilet downloading repair instructions is worth it to record to disc or print out for future reference. they're free.
uk & europe www.thetford-europe.com
australia www.thetford.com.au (even get request from australian campers)
australia site has stockist list.
home page select english {if in australia forget this selection it doesn't come up)
select customer service (top line)
select products from top line
select bulit in or portable which ever applies.
select user information from list on right.
select repair instructions from list on right
select built in or portable which ever applies.
select select your toilet series model number from right list.
you will now be in the pdf listings for your range of toilets just select those that apply to your toilet and down load them they're free.
as you go through watch for 'ask thetford' on left listings
you may not find what you want and you can send them a message.
for safety reasons which i agree with thetford do not offer repair advice for fridges. refer to service centre
Bob
April 2011