Dripping sound in the drain pipe when gas furnace is on

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  #1  
Old 11-23-17, 05:25 AM
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Dripping sound in the drain pipe when gas furnace is on

I have a high efficiency gas furnace in the attic of 2 story house. The condensation is connected to the basement sewer ejection pump. Every time when the furnace is running, I can hear consistent dripping sound behind the wall somewhere between the first floor and basement every 5-10 seconds. It stopped immediately when furnace stops. I can see the water dripped out from the end of pipe to the sewage ejection pump in the basement, but where the sound comes from is about 15 ft away from the ejection pump. And the sound is more pronounced on the first floor. Since the basement is finished, I couldn't tell the plumbing behind the wall.

Where should I start to troubleshoot the problem? Thanks all. Happy Thanksgiving.
 
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Old 11-23-17, 06:51 AM
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If it's 15 ft away, it sounds like there is an elbow in the pipe & that's where the sound is. The real question is, why is there so much condensation.?
 
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Old 11-23-17, 07:17 AM
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I thought it is normal to have condensation from high efficiency furnace.
 
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Old 11-23-17, 07:37 AM
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Then don't worry about it if it's normal. I don't see how you are going to stop the noise without re-piping the drain.
 
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Old 11-23-17, 03:09 PM
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I thought it is normal to have condensation from high efficiency furnace.
Yes... it is perfectly normal to have condensation from a condensing furnace, Usually this type of furnace is not installed in a cold attic.
 
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