TRUMA DRAIN PIPE DRIP

Sussex Duo
We have just got back from our first full usage of the van this year. No apparent problems. Water and van heater working well with no apparent water issues in the van. Before leaving the site I drained the waste water tank but not the water in the Truma. After a short while at home I noticed a small amount of water dripping from the drain pipe for the Truma under the van. One drop every 30/ 40 seconds. Has anyone any ideas why this may be happening? Is it something that I should worry about? We are parked on a slope back end in, a position that I know that the fridge does not like.

Noticed the same on mine yesterday. Drip stops once the water pump has charged and put the plumbing under pressure. Try recharging the system.
Clive