Truma combi .

We have a 2012 Sussex Duo. The confusing bit is that the heater fitted, according to the label is a  Combi 2E, although the instructions that were issued with the vehicle indicates that it is  a 4/6 E . Reading through the forum there seems to be a little confusion on how many heating ducts should be fitted to the combi,3 or 4. Although both operate the same way, maybe the 2E has only three tubes ? The system does seem to be reluctant to provide adequate heating when just on gas, ( wild camping) . Any comments would 
Be appreciated.
Thanks
Tengah 74

Although the energy source for the heater is gas, it relies on an electric fan to blow the hot air out and that can discharge your leisure battery quickly.  Could that be your problem?

Peter

I believe that the Sussex Duo is a slightly upmarket version of the Warwick Duo and in this case the heater fitted to a 2012 specimen will be a Combi 4E

The Combi 6E was fitted from 2014 in order for Auto-Sleeper to be able to claim class 3 winter performance (able to heat the inside to 20c within one hour when the outside temperature is -15c)

The Combi 4 normally has 3 heat outlets fitted (it is the 6E which must have all 4 fitted).

A Combi 2 sounds quite wrong and would be undergunned for a 6 metre panel van, are you sue that the label (on the heater?) says that it is a 2E?

The Sussex Duo should have a Combi 4e or a 6e.
Gas operation should not be a problem.
The fan does not discharge the battery quickly.
The 2e or 4e may be fitted with only three outlets but works better with four.
See [You must be registered and logged in to see this link.]
on how to fix this.
If it has only three outlets then the fourth outlet will be blanked off.
The blanking plug falls out so that the heat melts things under the bed instead of heating the van.
Pete

Thanks for your replies. I have double checked the unit and the unit label has a 2E UK , with I assume an ident code of CBE 203-23164152. I have emailed Autosleeper for clarification, as I understand the 4E that should be fitted has a greater gas consumption than the 2E , which may be the reason that the van takes such a time to heat up on gas only. We shall see !

Our Broadway is fitted with the Combi 4 but only has 3 opening ducts, find it very efficient at heating the vehicle from cold, within 10 or 15 mins of being on it's very toasty... 

Agree with Peter Brown though that it does impact on the leisure battery when solely running on gas as I found out last weekend at the Newark show over the 3 days.


Edit: I boobed earlier, our Broadway does have 4 opening ducts... 
I forgot to include the one in the bathroom 

Very interesting.
The Sussex Duo is a special version of the Warwick Duo which IMHO never had less than a 4e so where did the 2e come from?  You could ask AS...
The 4e can use twice as much gas.
The 2e should be adequate but it will take longer to warm up because it has to heat up the internal heat exchanger with less gas.  It will not blow hot until the heat exchanger is hot.
If you do happen to have an EHU then start it up on combined gas and electric - there is a thread about this somewhere.
Obviously the fan will impact on the battery eventually but it only uses about 1 amp.  The Combi should shut down with an error when the battery voltage drops to 10.5 volts.
Pete

Plot thickens. Marquis informs me that I have a 2E fitted . Awaiting a reply back from AS. If I am to go down the why route , I need to find anywhere it states that a 4 E should be fitted.  However having had experience with Marquis, I guess I will be into a no go area !! Have asked them the difference between the two units so watch this space.

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The handbook is linked from the page above and specifies the 4E

Peter

Thanks Peter. Marquis have offered me the operators manual for the 2E !!!! Now gone back too Marquis with the statement from my Op manual, stating it shouldbe a 4 E. Will see what they suggest.
Neil