Thankfully I have my problem sorted with the steam coming out of my outside vent. It turned out to be nothing more than a build up of condensation in the flue liner pipe. Some thing that I have never seen happen before with my heating in the 14yrs that I have had the van. Also for any who might have the same Truma heater model as my own a C6002/C3042, it doesn't have a heating element to heat the water but a heating band that wraps around the water jacket and unlike a more modern models it doesn't have a re-set button. 
A big thank you to Derek Walsh Campers in Kildimo Co Limerick and John for his bang on diagnosis over the phone.
Seamus.
								
																A big thank you to Derek Walsh Campers in Kildimo Co Limerick and John for his bang on diagnosis over the phone.
Seamus.

 
																																													 I think the consequences speak for them selves.
  I think the consequences speak for them selves. 
 
																																													 
 
 plus there is a lot to be said for a carbon monoxide detector
  plus there is a lot to be said for a carbon monoxide detector