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Condensation building up in lower compartment of goodman 45btuh furnace in counterflow position 95%a.f.u.

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Make sure all drains and hoses are connected to the lowest positions and that they are free of any blockage or debris. If there is not a vent or stand pipe on the drain line as it exits the furnace cabinet, put one in. A stand pipe is a Tee with a vertical pipe going up approximately 5" and allows the water to drain easily by breaking the vacuum normally experienced by the inducer blower.

Posted on Feb 03, 2010

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1 Answer

Condensation water drips from top of unit


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80%, 90%, and 95% Gas Furnace Manual


http://johnstonesupply9.com/TechDocs/Goodman/Furnaces/GMV9%20Variable%202-Stage%20Upflow%20Gas%20Furnace/GMV9%20Service%20Man.pdf

After giving up on Yahoo, I found this on Google. It's the detailed manual for 80%, 90%, and 95% gas furnaces. Hope this helps!

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Goodman Model GMV950905DX-an electrical surge burned out the transformer which I replaced, also replaced the circuit board. The variable speed furnace will no longer kick into high speed and it will l


If I remember correctly, there are dip switches on that control board that can be set individually. It is possible that it is just a setup issue. The switch positions should be explained in the installation instructions. I know that some Goodman and Amana two stage furnaces can be controlled by a single stage thermostat, but the dip switches have to be set properly. If the switches are set correctly the furnace will run in low stage heat for approximately 5 minutes and if the thermostat hasn't satisfied yet, it will kick in to high stage heat. I hope this points you in the right direction!

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it could be condensation. or poor seal at roof. probably the seal at roof. also check the larger copper line is it sealed good? if any spot is not this will cause leaking when in cooling mode. maybe dripping from line onto vent.

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The problem is too much gas as opposed to not enough air. It is still running rich. Did you take into account the elevation of the location your furnace is installed at. The higher above sea level the less air that you have to aid in cumbustion. The condensation is from excess gas being cold and causing water to accumulate. Can you run it like this? Yes but it will cause issues with soot and carbon deposits. It will also cost you more money in the long run.

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The flame sensor needs to be cleaned. This video might help you understand how to clean the flame sensor.

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My son has condensate building up in his flue and running down into the furnace. It is a 2 stage furnace. The contractor who installed it blames it on the chimney. Is that likely?


It is for sure a venting issue, depending on where you are located, it sounds like the local building code inspector was not involved for an inspecton of the furnace replacement. When the flue condensates like that, it is usually because the flue is the wrong size, usually to big,or it is dumped directly into a masonary chimney, and the chimney was not lined to the top.
I hope this answers your questions, please rate me and let me know if I can help further.
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1 Answer

Can I change airflow direction with Goodman GMS8?


I would probably use a furnace for the correct application. However some motors do have a reverse speed connection. Besides the blower speed taps,
capacitor wires and the nuetral wire. There are two wire sets that you can switch that can do this if your blower motor is equipped.

You might experience some airflow problems, probably a lack of airflow, if the furnace was installed
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One of the drain tubes (overflow) is plugged. Unhook each one and clear them of any debris.

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If the exhaust comes off the top of the furnace, you will need to make sure the condensation will drain all the way back to the condensate outlet found at the base of the inducer blower. If you are having to remove the tube from the pressure switch, there must be a blockage from the inducer down to where ever it drains to. Check to see if all tubes are free of blockages and if there is a condensate trap, clean it out. If the pressure tube you mentioned is facing up toward the blower allowing water to flow into it, reposition it so water will not enter the tube.

 

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