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Is it typical for water to drip from furnace through pipe to outside? i was told from city inspector that this is indicator that unit has problem and it's releasing water throught secondary valve.

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Condensation should go to your drain pipe, sometimes the pipe that goes outside doesnt have declivity for the water to go in the drain pipe

Posted on Aug 24, 2010

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Posted on Jan 02, 2017

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Does my furnace require outside air?


I'm surprised the building inspector allowed the condensing furnace you described draw combustion air from the garage !! I'm not familiar with any manufacturer that recommends that as normal practice. Virtuall ALL two pipe condensing furnaces require both pvc pipes to be terminated OUTSIDE the structure with specific heights and distances apart. There is also a limit to the length of both the flu and the combustion air piping and each 90 degree pvc elbow adds the resistance equivalant of roughly 10' of straight pipe. If re-routing is required, you have to bear in mind the direction of 'fall' in the piping usually goes back towards the furnace and remember two 45's may give you a greater variance of change in the piping and still be equal to the equivalant of one 90.

Personally, I would never suggest terminating the fresh air (combustion air) intake between floors of a structure.

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I cleaned out the water from the drip pan, cleaned out the pipe and it started working. Now the drip pan is full again and the furnace is not working


something has to come out the other end. where do you think the water is going? it has got to go outside, if not it will end up in the condensate tray and shut off your unit if you have a float switch.

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Condensation water does not leave pan when it gets full you can hear the water being picked up and thrown around in the unit. There is no water flowing either inside or outside unit.


What you hear is an indication that the drain hole in the drip pan is clogged. Check the outside of the bottom of the drip pan. The hole may be hard to locate, as the clog can blend in with the drain hole. It may take patience & persistence to find it. A pipe cleaner works well to clear the hole. And while you're at it, check the downward tilt of the rear of the unit. The general rule of thumb is 1/4" to 1/2" downward tilt. This will help to water to flow to the rear of the drip pan and out thru the drain hole.

Hope this helps you and thanks for choosing FixYa.

Sep 05, 2011 | Electrolux Heating & Cooling

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I have a Weather King AC/Furnace in the attic that's dripping water into the drain pan. When we purchased our new house it came with this unit and it never dripped ater. Now, the water is dripping towards...


I assume it is dripping water when the AC is running. If you look at the attic unit, there should be a PVC pipe running from the unit - probably an insulated PVC pipe. This pipe probably goes across the attic to the edge of the house and drains outside. The drain pan may also have a drain pipe, but the one on the AC unit is the issue, and is probably plugged. Go outside and see if you can locate the AC drain pipe. See if the ground is wet below the pipe and if water is steadily dripping from the pipe (with AC running). If the pipe and ground are dry, the pipe is plugged. If you have a wet/dry vac, try connecting it to the drain pipe outside to see if you can **** the pluggage out. If you can get it clear, water should start dripping out of the pipe. This same thing happened at our house. I decided to cut the pipe in the attic, and add in a PVC isolation valve, tee, and water hose connection with plug, so I can valve out the AC unit from the pipe, remove hose connection plug, and hook up a water hose and flush the line to outside. Lowe's sells all of the PVC pipe fittings. The water pressure from the hose will always flush out the algae and crud to the outside of the house. I can also remove the plug and pour a cup of bleach down the drain pipe every couple of months to keep algae growth in check. I also cut out the trap (u-leg) from pipe in the attic and purchased a ready made trap a Lowes (the contractor who built our house had made a lousy homemade trap). I purchased a few PVC elbows and installed the trap on the drain pipe outside. By the way, our AC drain pipe comes out of our wall outside and drains near our outside unit. Our secondary drain pan drain pipe comes out outside from an eave on the side of the house. I don't know what you drain line looks like (it may have a port to add bleach, or some cleanout provisions, maybe not). If you choose to modify/improve it, then make a sketch of it, go to Lowe's and get the PVC parts you need + PVC pipe primer and cement. PVC cement dries fast. Remember, the pipe must flow downhill from you AC attic unit. You can use a regular wood saw to cut the pipe. I hope this helps you. You need to keep the drain line clear as algae will continue to grow in it. Pouring bleach in the line every month or two helps. You also need to check maybe once a month that the line is draining properly (check to see if dripping outside). You can get some serious water damage to your ceilings if the water backs up and overflows. I discovered that our drain line was plugged just in time as our drain pan drain line was also partially plugged and drain pan was about to overflow.

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You're beating your head against a wall! Just do what the inspector says or he can make life very hard. EVERY house needs fresh air!

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you need to have a drip line that take away the water when the ac is on so the water does not goes into the furnace ,also check for leaky line that could causing water to leak back

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Comfort 92 Gas heater Exhaust


the slope is downwards to furnace.The slope isnt for the moisture it is a rise for the flue gas to go outside.The intake is usually connected to the furnace to use outside air for the combustion but it does not have to be.if it isnt an option to take the pipe apart to glue it all up you can seal the water leaks with silicon.anymore questions hillbuck29@aol.com

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