We have a drip ! Auto Trail 2013

There is probably a hot water drain pipe and a hot water pressure release pipe.

Your pump is flashing on to bring the pressure back up to normal due to the leak (drip).

If the drain is dripping...renew the drain tap.

If the pressure release valve is dripping you may need to replace that.

On my much older Tracker I replaced the drain tap over a year ago and it still has a very slow drip (possibly caused by a slightly higher pressure new pump).....If the pump gets on my nerves (flashes every 5 or 10 minutes for 1 second or so) I simply switch it of.

You could also check the Frost Stat if it has one. Idea being that when it gets really cold it dumps the water out of the water heater. As has already been said. Don't leave it. It needs fixing.

thanks for the feedback. It does not have a frost stat and the temperature over the weekend was probably 5 degrees lowest. I've dropped email to dealer we purchased from and will see there response. Really want it fixed as we are off to Strasbourg on Boxing Day. Will keep you posted on resolution. 

hot water drain valves can leak (drip, drip) due to the washer becoming a bit hard, also they can 'rock up', and not seat properly, from use in hard water areas.

a quick dismantle (once system drained) and clean might do the job....

as DD says, also check out other areas in the van as just a small leak can easily build into something larger and much more difficult to eradicate...

good luck.

drip has gone ! Emptied fresh water tank and drained system. Re-filled and restarted the system. The drip has not returned ! Thanks for all the feedback, it's in for a service February so will get it checked out.