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Old 10-08-2012, 07:39 AM   #1
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Water in Furnace exhaust pipe


My high efficiency furnace keeps getting enough water in the pvc exhaust pipe, you can hear it gurgle, to prevent the furnace from working properly. Suck out the water with my shop vac and the furnace runs fine for about a day then I need to repeat the process. How do I fix this?

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Old 10-08-2012, 08:34 AM   #2
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Water in Furnace exhaust pipe


Sounds like your condensate line is clogged somewhere. Check the tube that comes off the collector that connects up to the condensate drain. If that is clear just keep looking farther down the line.... or if you have a setup that drains to a condensate pump make sure that is working and not backing up.

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My high efficiency furnace keeps getting enough water in the pvc exhaust pipe, you can hear it gurgle, to prevent the furnace from working properly. Suck out the water with my shop vac and the furnace runs fine for about a day then I need to repeat the process. How do I fix this?

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Old 10-08-2012, 10:50 AM   #3
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Water in Furnace exhaust pipe


Check the slope of the exhaust, it must be a minimum of 1/4" per foot to drain properly, sloping back to the unit. Any pooling of water will cause a gurgling sound and the unit to shut-off.

Last edited by hvac benny; 10-08-2012 at 10:52 AM.
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Old 10-08-2012, 08:53 PM   #4
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Water in Furnace exhaust pipe


agree with benny check for slope on line ...also check for belly or dip if its a long run....ben sr
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Old 10-08-2012, 09:56 PM   #5
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Water in Furnace exhaust pipe


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agree with benny check for slope on line ...also check for belly or dip if its a long run....ben sr
Good point. Make sure it has adequate supports. When the pipe heats up, it can sag if not supported properly.
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