Frozen caravan water problems

Assuming you have the pressurised system (most common), If you have developed a major leak then you may find your water pump will  be cycling on and off when the taps are closed as it will be trying to pressurise the system.

We found this out when the external feed pipe from the barrel had disconnected inside the whale external connector, the pump was quite happy running away as the pressure switch in the inlet gave a demand signal. Some of the water got inside the caravan through the poorly designed non-water tight connector housing in the caravan wall..

We always switch off the pump when away from the caravan when on site.

As someone said, "Blimey, where's this thread been hiding these years?!" 

I confess I've not just now read all the posts between, but am happy to report, after my original query, that we bought our caravan, it's still going strong, has been round Scotland, the Outer Hebrides, France, and hopes to  head to France again later this year. And the water system hasn't frozen yet, though I have been draining it down during frozen winters.

But I hope the other related questions which arose have been sorted!