I have a 2 year old High Efficiency Furnace (G96VTN0601714A) that has had the same issue, 2 years in a row, at the start of each cold season.
The first time I go to run it as winter approaches, it runs fine for 20m, but then stops. It will fail to light and gives an error code suggesting an issue with the pressure switch/sensing.
The first year, I got the installer out and after messing around for a while, it miraculously started working again. This time though, I had to go to another company, who told me my pressure switch was bad. A week later, the new switch arrives, they install it, but the issue remains. After some more tinkering, they eventually fix it, telling me there was 'water in the inducer motor', likely coming from the vent pipe on the roof.
As annoyed as I was that they had me pay for a new pressure switch likely unnecessarily, I'm just glad it's fixed. But now I'm wondering about this 'water through the vent pipe' story.
I've been reading that the system should be able to handling plenty of water down this pipe, just from condensation during operation. But the fact that it's only happening after being idle during summer is making me think it could be some truth to this? In fact, next to the error code in the manual, it does explicitly suggest 'water in vent piping' or 'plugged condensate drain' as two possible reasons for the issue.
The roof vent already has a 90 degree elbow, which I believe should be enough to keep rain out? But is there something about the drainage system that wouldn't function when the furnace is off?
The first time I go to run it as winter approaches, it runs fine for 20m, but then stops. It will fail to light and gives an error code suggesting an issue with the pressure switch/sensing.
The first year, I got the installer out and after messing around for a while, it miraculously started working again. This time though, I had to go to another company, who told me my pressure switch was bad. A week later, the new switch arrives, they install it, but the issue remains. After some more tinkering, they eventually fix it, telling me there was 'water in the inducer motor', likely coming from the vent pipe on the roof.
As annoyed as I was that they had me pay for a new pressure switch likely unnecessarily, I'm just glad it's fixed. But now I'm wondering about this 'water through the vent pipe' story.
I've been reading that the system should be able to handling plenty of water down this pipe, just from condensation during operation. But the fact that it's only happening after being idle during summer is making me think it could be some truth to this? In fact, next to the error code in the manual, it does explicitly suggest 'water in vent piping' or 'plugged condensate drain' as two possible reasons for the issue.
The roof vent already has a 90 degree elbow, which I believe should be enough to keep rain out? But is there something about the drainage system that wouldn't function when the furnace is off?
source https://hvac-talk.com/vbb/threads/2243960-Water-buildup-in-furnace-vent-over-summer?goto=newpost
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