Question about Goodman GMS90703BXA Heater

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Condensation not draining properly and causing rust in cabinet.

Unit is actually an Amana 90. It looks just like the Goodman Furnace.
Condensation is leaking out of the bottom of the black plastic cover where the ventor motor is mounted. Are the cover bolts loose?
It is just a slight trickle of water, but it collects and causes rusting of the metal panels.
Is there a “proper’ fix for this? Is the furnace not level?

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Probably a bad gasket between the inducer housing and the secondary heat exchanger. They may be available from a goodman dealer.

Posted on Jan 04, 2009

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Furnace has water under it, why? Its a Dayton gas furnace.


There are several questions that need to be answered about what type of system you have, but i found this posting that may help:
As your gas furnace runs, is there water leaking at the base? Is the furnace's air filter wet, too?There are a few things that could be happening here. But if you have a high-efficiency furnace, here's the most common cause: a condensation leak.
We'll explain why a furnace creates condensation, and what's causing it to leak out of your furnace.
Note: You'll know if you have a high-efficiency furnace if:
  • The yellow energy guide tag says your furnace's efficiency is 90% or higher AFUE.
  • The vent/flue pipe is white PVC as opposed to metal.
Why a high-efficiency furnace creates condensation
How in the heck does a high efficiency furnace create condensation/water anyway?
It's all about how the furnace extracts heat from combustion gases.
A lower-efficiency furnace extracts some heat from combustion gases and then quickly vents them out the flue pipe.
But a high-efficiency furnace, to extract more heat, has 2 heat exchangers. These allow the furnace to extract heat from the gases for a longer period of time. This causes the combustion gases to cool and then condense.
That condensation then exits out your home through a drain. But if that water is pooling around the furnace, there's a problem preventing it from draining properly.
Causes of a condensation leak around a high-efficiency furnace
  • Clogged condensation tubing
  • Clogged condensation drain
  • Breaks in the condensation line
  • Issues with the condensate pump (if you have one)
You'll need a furnace technician to diagnose which of these is the issue and then fix it.
Other causes of leaking water around a furnace
If you have a conventional, standard-efficiency furnace...then its flue pipe may be incorrectly sized.
If you have a whole-house humidifier connected to the furnace...there may be an issue which is causing the humidifier to leak into your furnace. Your humidifier should be getting annual maintenance from a professional to prevent this.

Dec 13, 2016 | Dayton Heating & Cooling

1 Answer

Why would my goodman gas furnace leak water from the panel that the blower motor is attached to?


the only reason water would come out of your furnace is if you also have your AC in the same system, and the condensation line is not allowing the water to drain properly.

If the water only happens during cooling, clear the condensation line. If it is happening during a heating cycle you may have an improperly connected thermostat, a bad control board, etc...

Nov 16, 2014 | Goodman Heating & Cooling

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New goodman 80% gas furnace leaking condesation down exhaust vent


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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Hi, I have an Amana 90 Air Command Gas Furnace that is dripping water. The unit has a Becket Corp condensate removal pump on the side that is working properly (I tested this by pouring water into one of...


The source of your problem may be the drain pan that captures the condensation and then drains it into the condensate pump hose.

Yes you'll have to remove the side panel to access the pan. The pan drain may be clogged with lint and mold. It's not difficult to clean once you access it. If you see mold, you may want to place a teaspoon of bleach in the drain pan once it has been cleaned. Future condensation water will dilute it and move it around.

Feb 24, 2011 | Heating & Cooling

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


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.

Feb 03, 2010 | Goodman Heating & Cooling

1 Answer

The inducer fills with water and passes into the pressure switch


This unit is designed to condense, I suspect that the drain is blocked by some debris. Remove the larger hoses from the burner box and inducer motor and blow into them to clear any debris. Plug the end of the hose so you don't force water into either the inducer or burner box. Make sure that there is a vent on the drain just as it leaves the furnace cabinet. This will assist the drain to work properly and not cause the condensation to go up in the pressure switch hose.

Jan 04, 2010 | Heating & Cooling

1 Answer

Amana 90% model #GUCAO45AX30 SER# 0109143635 UNIT MAIN BURNERS LIGHT UP THEN SHUT DOWN IN A FEW SECONDS. DRAIN LINES ARE CLEAR, VENT PIPE CLEAR OF CONDENSATION. I BYPASSED T-STAT JUMPERED R-W NO HELP,...


check to see if the flame rod tip is in the flame(like the hot junction on a thermocouple). the pressure switches are a normally closed switch and a blocked flue could cause them to open. the circuit board should run through the safety switches and check them before the gas is opened at the valve. also the drain lines that you see at the inducer fan should be free of condensation but if the inducer fan has condensation in it, it will open the airflow safety switch. you will hear the crackling noise from the fan. also there should be a trap below the fan that should be full of water to keep the fan from pulling air from the wrong place. I would not suspect the board at this point

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1 Answer

Water leaking out bottom of Goodman propanefurnace drain tubes are clear. draining out under the actual furnace


Check the top of the gas flue. Make sure the cap is on it. If not it will allow rain to get inside. If this is only a furnace, this is the only thing it could be. Nothing produces water in a furnace. If it has an A/C coil attached. The condensation drain might be stopped up allowing it to leak.

Oct 13, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman furnace may be producing to much water


Your furnace is more than 90% efficient and extracting so much heat from the gas that it condenses instead of blowing out steam. This is good! Figure that for every dollar you spend on fuel, you are getting back 90+ cents back in heat. Compare that to the typical units that only get 70 - 80 cents back in heat.

Yes you should drain your condensate to a proper drain via gravity or a condensation pump. I would recommend you treat the condensate first with a acid neutralizer prior to draining in municipal drains due to it's high content of sulfuric acid. You can purchase these filter type neutralizers on the net or at a good heating wholesaler.

Feb 11, 2008 | Goodman GMS90703BXA Heater

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Goodman 90% gas heater condensation build up


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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