Elddis majestic 195 water pump

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It's not unusual for pumps to momentarily re-pressurise themselves occasionally but every five to ten minutes is unusual. As said a good idea to check for any leaks as a first step. It may also depend on the system employed by the manufacturer. Do you know whether you have an external pump or an internal submersible pump? The latter is more prone to losing pressure. A submersible pump will have an, external to tank, pressure switch as illustrated below. It may just need a little adjustment. Your handbook should explain how to do this.

David

If you do have an external pump and you cannot find any signs of leaks it maybe the pump itself causing the problem. I have had several pumps fail in the motorhomes I have owned some after as little as 5 years use. The Whale pumps I had exhibited exactly the same symptoms as you describe, the internal valve seals fail ether because they are old or have been mistreated. By mistreated I mean the system has been flushed with unsuitable substances causing the rubber seals to harden and they then don't seat properly.

peedee

Pump seems to be running constantly and water leaking from under loo and wardrobe 

Despite bleeding/venting system thoroughly after winter, I recently had a problem with air entering the system.

Our system has always 're-pressurised' itself on occasion.

No leaks but I did find that the glass screw in 'in-line mesh filter' was not completely tight, so I took it off, rinsed it out & refitted it.

Problem solved.

So worth a try.

Hth