Truma Aventa Condensate Drainage

[Rolind]

Has anyone with the truma had any luck getting the condensate to consistently drain through the drain tube and not down the side of the trailer? It has always been intermittent for me and lately has stopped altogether. Yesterday I took the evaporator cover off and gently blew air up the drainage tubes. The curbside easily accepted air from below but wouldn’t drain water from above. The street side was occluded from below and won’t accept any air, but drained freely from above. 
I thought I would ask before I just set aside my OCD and accepted condensate drainage on the side of the trailer. 
Thanks in advance for any suggestions. 

[Steve Morris]

Mine almost never go down the tubes. One side occasionally, the other not at all. I’ve run string trimmer line up from the bottom, but that doesn’t seem to do anything. I haven’t popped the cover, yet

[johnwen]

1 hour ago, Steve Morris said:

Mine almost never go down the tubes. One side occasionally, the other not at all. I’ve run string trimmer line up from the bottom, but that doesn’t seem to do anything. I haven’t popped the cover, yet

Ditto...

[johnwen]

2 hours ago, Rolind said:

Yesterday I took the evaporator cover off

Was that very difficult?

[Patriot]

We have never had an issue with water running off on our roof from the either of the (2) condensate cups in the unit. We had our “Demonic” Penguin removed and retro fit with the Truma Aventa in May of 2023. At the time of the retrofit,  I spoke to the tech doing the install about over flow on the roof possibly occurring. He said that its really important to have the trailer dead level when your set up and running the Truma. The condensate cups are not very deep and can fill quickly, and the drain tube handles this under normal operation. ✅

I learned that it’s really important that the (2) Truma condensate tubes do not have a kink in them. This will result in the cup(s) not draining properly into the OEM condensate drain lines. I think this may have possibly been an install concern early on. This would cause the condensate cup(s) to over flow onto the roof. The tech mentioned that he would make sure that the tube would be installed kink free. It works as designed.

I am not suggesting that anyone here is not setting up their trailer dead level. But in order for the 2 small condensate cups to drain properly this is how it’s designed. If you are set up dead level and you still see water dripping off your roof, you may have a kink in one of the condensate drain hoses or maybe it’s just plugged up. 

Edited Thursday at 12:09 PM by Patriot

[Rolind]

On 7/23/2025 at 4:35 PM, johnwen said:

Was that very difficult?

Not really. You need to peel the sealant off the eight screw heads. I assume it was dicor. Once those are off the shroud can be lifted off. There are two more screws holding the evaporator cover on. Once those are removed the evaporator cover can be removed. All screws are T25s  

To be honest once you are in there, there isn’t much to see. One thing I did learn is that the street side drain at the evaporator connects to the curbside drain under the back of the trailer and same with the other side. 
I had always assumed, street side evaporator drained to the under the trailer street side drain. 
I also learned my unit is slightly off level with street side being lower when the trailer is level. Of course that is the drain tube that is occluded. 
be sure to seal up the shroud screws when you put it all back together. 

[Rolind]

On 7/23/2025 at 5:41 PM, Patriot said:

We have never had an issue with water running off on our roof from the either of the (2) condensate cups in the unit. We had our “Demonic” Penguin removed and retro fit with the Truma Aventa in May of 2023. At the time of the retrofit,  I spoke to the tech doing the install about over flow on the roof possibly occurring. He said that its really important to have the trailer dead level when your set up and running the Truma. The condensate cups are not very deep and can fill quickly, and the drain tube handles this under normal operation. ✅

I learned that it’s really important that the (2) Truma condensate tubes do not have a kink in them. This will result in the cup(s) not draining properly into the OEM condensate drain lines. I think this may have possibly been an install concern early on. This would cause the condensate cup(s) to over flow onto the roof. The tech mentioned that he would make sure that the tube would be installed kink free. It works as designed.

I am not suggesting that anyone here is not setting up their trailer dead level. But in order for the 2 small condensate cups to drain properly this is how it’s designed. If you are set up dead level and you still see water dripping off your roof, you may have a kink in one of the condensate drain hoses or maybe it’s just plugged up. 

Thanks for the input. Your post got me thinking and today I’m going to check behind the wall in the basement and see if I can see any kinks. 
Btw are you going on the Tremor forum truck plant tour in August? It would be great to meet you. 

[Patriot]

30 minutes ago, Rolind said:

Btw are you going on the Tremor forum truck plant tour in August?

Glad to help. I was not aware of the truck plant tour, so right now, I don’t have plans to attend. I will check the Tremor forum for details. 

Let me know what you learn on your Truma condensate lines. 

[Patriot]

45 minutes ago, Rolind said:

be sure to seal up the shroud screws when you put it all back together. 

I used small 3” round pieces of XPEL PPF to seal the (8) cowl/shroud screw openings on the Truma. This hack works great and will not leak. The PPF can easily be removed if access is needed. You can barely see the PPF after install.
 

This-
https://www.xpel.com/products/category/paint-protection-film?srsltid=AfmBOoofOST9nDR0K5MGLu60LA51g5o0X91aVYGGCMG-MDnbjXq8c0Bf

Edited Friday at 02:45 PM by Patriot

[johnwen]

3 hours ago, Rolind said:

Not really. You need to peel the sealant off the eight screw heads. I assume it was dicor. Once those are off the shroud can be lifted off. There are two more screws holding the evaporator cover on. Once those are removed the evaporator cover can be removed. All screws are T25s  

To be honest once you are in there, there isn’t much to see. One thing I did learn is that the street side drain at the evaporator connects to the curbside drain under the back of the trailer and same with the other side. 
I had always assumed, street side evaporator drained to the under the trailer street side drain. 
I also learned my unit is slightly off level with street side being lower when the trailer is level. Of course that is the drain tube that is occluded. 
be sure to seal up the shroud screws when you put it all back together. 

Thanks much, Rolind!

[Rolind]

So despite my pledge to suppress my OCD tendencies, I spent some more time with my condensate hoses today. The hose is not kinked behind the basement wall and I cannot see an obvious kink when I examine the hose under the evaporator. There is very limited access to the  condensate hoses from the roof. At this point, I’m going to really quit and live with condensate on the side of the trailer. If I were to pursue things further, I think the next step would be to lift the ac unit off the roof and gain better access to the drain tubes. This is more than I am willing to do.