ᐅ Pluggit Avent P310: Water inside the unit – is a second drain hose advisable?
Created on: 21 Apr 2026 14:21
K
kahless1AK
kahless1A21 Apr 2026 14:21Hi 🙂
This is about a Pluggit Avent P310. The system has been running completely trouble-free for around five years. Now, for the first time, water has appeared inside the unit, and the residual-current device (RCD) tripped as well. The water was standing at the bottom of the unit below the heat exchanger, and the area around the outdoor air filter was clearly wet.
The outdoor hood, or outdoor air intake, looks unchanged and normal to me. Nothing appears obviously damaged or different than usual. However, on the day in question, it rained at a rather sharp angle directly towards the outdoor air intake, so it’s possible that water entered from outside. What surprises me is the amount of water.
Regarding the condensate drain:
My system has only one hose connected. From everything I have found so far, a single condensate hose generally seems normal. However, the water was also standing on the other side, in the area where no hose is installed.
So the question is:
Would it make sense to temporarily connect a drain hose on the other side as a test, so that any standing water there can also drain away in the future? Or would that be a bad idea because water shouldn’t normally reach that area by design?
A colleague and I also considered whether there might be a small crack or leak between two chambers, allowing water to get to the other side. However, at the moment, I consider that unlikely.
Does anyone have any other ideas about what I should check or whether such an additional hose would even be useful?
Photos:
Outdoor unit:
P310:
This is about a Pluggit Avent P310. The system has been running completely trouble-free for around five years. Now, for the first time, water has appeared inside the unit, and the residual-current device (RCD) tripped as well. The water was standing at the bottom of the unit below the heat exchanger, and the area around the outdoor air filter was clearly wet.
The outdoor hood, or outdoor air intake, looks unchanged and normal to me. Nothing appears obviously damaged or different than usual. However, on the day in question, it rained at a rather sharp angle directly towards the outdoor air intake, so it’s possible that water entered from outside. What surprises me is the amount of water.
Regarding the condensate drain:
My system has only one hose connected. From everything I have found so far, a single condensate hose generally seems normal. However, the water was also standing on the other side, in the area where no hose is installed.
So the question is:
Would it make sense to temporarily connect a drain hose on the other side as a test, so that any standing water there can also drain away in the future? Or would that be a bad idea because water shouldn’t normally reach that area by design?
A colleague and I also considered whether there might be a small crack or leak between two chambers, allowing water to get to the other side. However, at the moment, I consider that unlikely.
Does anyone have any other ideas about what I should check or whether such an additional hose would even be useful?
Photos:
Outdoor unit:
P310:
Hi,
a wet outdoor air filter is not a normal condition, even in rain. The system draws in moist air, of course, but not water in such amounts that everything below floods and the residual current device (RCD) trips.
With the Avent P310, it is usually the case that only one condensate drain is actively used; the second connection is often optional depending on the installation position. If your trap is on the left side, that generally fits. The question is whether it is still clear or has become clogged over the years, as 5 years without cleaning is quite a long time.
What makes me suspicious is the area around the outdoor air filter—it only gets wet if water enters through the intake or condensate is distributed incorrectly. Have you checked the outdoor hood to see if rain might be driven directly inside or if the drip edge is missing? Or is the intake pipe installed with a slight slope towards the unit, which is a common, often overlooked mistake?
And honestly, if the RCD is already tripping, I wouldn’t just “observe” it any longer, but rather find out whether water is reaching electrical components, as this is no longer a cosmetic issue.
a wet outdoor air filter is not a normal condition, even in rain. The system draws in moist air, of course, but not water in such amounts that everything below floods and the residual current device (RCD) trips.
With the Avent P310, it is usually the case that only one condensate drain is actively used; the second connection is often optional depending on the installation position. If your trap is on the left side, that generally fits. The question is whether it is still clear or has become clogged over the years, as 5 years without cleaning is quite a long time.
What makes me suspicious is the area around the outdoor air filter—it only gets wet if water enters through the intake or condensate is distributed incorrectly. Have you checked the outdoor hood to see if rain might be driven directly inside or if the drip edge is missing? Or is the intake pipe installed with a slight slope towards the unit, which is a common, often overlooked mistake?
And honestly, if the RCD is already tripping, I wouldn’t just “observe” it any longer, but rather find out whether water is reaching electrical components, as this is no longer a cosmetic issue.
K
kahless1A21 Apr 2026 16:29Where the hose is on the right side, the water drains properly, so there is no problem there. The issue is on the right side where there is no hose.
I will probably have to call the technician then...
I will probably have to call the technician then...