Question about Goodman GMS90703BXA Heater

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Water leaking out the bottom of my Furnace

There is water leaking out the bottom of my Gas Goodman Forced Air Furnance. I have the overflow tubes all hooked up. This is the 6th year using this furnace and have never seen this before. What would cause this? What should I check?

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I have a forced air gas furnace and water is leaking from just above the area where the hose is attached. I removed the cover but cannot figure this out. It only leaks (a lot of water) when the furnace is running. Please help asap!!! Tthanks so much, Dianne

Posted on Jan 03, 2010

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  • Anonymous Jan 03, 2010

    As it turns out, the drain hose (only one) had become unattached. I reattached it and then used some duct tape. Much appreciated!



    Question #2...While I was checking for the leak, I noticed there is also a small filter in that box...about 8x8x1...does this filter need to be replaced? It is now soaking wet. Sorry for the dumb question...recently divorced and trying to figure all this out. Thanks again.

  • Anonymous Jan 03, 2010

    Also, just wondering how much water should be draining when the furnace is running??? Thanks.

  • Anonymous Jan 04, 2010

    I will look for a replacement. The water from the drain tube goes through this 1" filter that is like a sandwich with 2 filters sandwiching a piece of what looks to be like foam. The wter then goes through this sandwich to the hose and finally drains through it there. Thanks again.

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One of the drain tubes (overflow) is plugged. Unhook each one and clear them of any debris.

Posted on Dec 20, 2009

  • Chandler Ede
    Chandler Ede Jan 03, 2010

    Not sure what filter is for but maybe if you can find a replacement, change it once per year. You can expect a gallon or two per day of water.

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That model should be a 93% efficient furnace which means it is a 'condensing' furnace. It has a coil designed to extract the 'latent heat of vaporization' from the flue gasses reducing flu temps from 450 degrees down to 120 degrees or so. In doing so, water vapor is 'condensed' out of the flu gasses and passes out of the second and lower drain of the furnace. It appears that there is a problem in either the "P" trap or drain line of the condensing circuit necessitating disconnection and cleaning.

I doubt the problem is in the a/c circuit, though remotely possible. The a/c would have to be stuck on and the evaporator would be freeze solid when the heat would be off then thaw partially when the heat is on overflowing the drainpan. Possible...but improbable considering this is a condensing furnace.

Posted on Nov 25, 2014

  • jabberwoky Nov 25, 2014

    considering i've repaired 8 goodman furnaces last month with exactly the same issue, and each one came down to two solutions: ie the thermostat was wired wrong, causing the ac to run during a heat call, or the main control board was fried causing the ac to run during a heat call, I'll reiterate my diagnosis.

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During heating season there should never be condensation build up, this is a symptom of the AC running. Check your outdoor AC unit to see if it is running while the heat is on. If so this is an indicator that your control board is cooked. A temporary fix is to disconnect the power to the outdoor unit via the quick disconnect or possibly an independant breaker for the condenser unit in your circuit box. Have a pro check the control circuit, and replace it if it shows bad.

Posted on Oct 19, 2014

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Had the same problem. I pulled the drain hose off of the fitting and blew it out-- no clogs. Had to unscrew the elbow fitting that looked like it was cemented into place. The whole thing unscrewed from the side of the HVAC. A little flood of water spilled out of the overflowing drain pan. Blow out the fitting as well. Dirt was clogged in the bend. Also, use a long skinny brush (like for cleaning bar glasses) and remove any build up in/near the drip pan. Do it in the spring before A/C season.

Posted on Feb 17, 2011

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