Get it tested by caravan repairer or any (in Uk part P registered electrician) it seems like a short circuit occuring if using water tapss trips it. I alway thought that water system was low voltage (12volts) for safety.
If you want contact below for ABI the caravan website doesn't have email address the other one 'Holiday home' has an online form.
ABI Caravans Ltd
Swinemoor Lane
Beverley
Humberside HU17 0LJ Tel:01482 862976
ABI Caravan Specs
As above doesn't have email address found this same company details with online email form.
I'm sure they will pass it on.
Contact details
©2013 ABI (UK) Limited,
Swinemoor Lane,
Beverley,
East Yorkshire,
HU17 0LJ
Tel: +44(0)1482 678000
Fax: +44(0)1482 887009
Email Us
email if not in uk.
You will need the chassis number usually etched on the window glazing that also gives them year of manufacture.
bob
January 2013