Question about Goodman GMS90703BXA Heater

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Goodman furnace was installed on its back- Problem?

A Goodman furnace was installed in my attic on its back- this is not recommended- but is it dangerous?

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  • Henry Russ May 11, 2010

    Vanmeterp, What type of furnace is it? Electric, gas, oil, ???Heat pump only? To answer your question, a furnace can be installed as an updraft or downdraft or in a horizontal configuration. If the installation was properly done... then it would not be dangerous. Your statement that it is installed on its back sound like a horizontal configuration. Is your furnace working ok? Henry

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The furnace can not be installed with the doors facing up. It will not work properly and yes it is dangerous. The unit needs to be flipped to its side, and the plenums and the ducts need to be changed around along with your Flue (vent) pipe, and gas line. HVAC-R Tech

Posted on Feb 08, 2009

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I have a goodman gms90904cxa gas furnace in the attic. the inducer motor starts and stops continuously which delays the start of the burners. Any ideas.


put a voltage meter across the leads of the draft motor checking to see of the supply voltage is intermittent also. If it is check the wiring for shorts. If none found then change the board.

Mar 01, 2015 | Goodman Heating & Cooling

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Where is the air filter for a Goodman # CAPF036A2A


If this is a case coil, they do not have a filter area, the filter is normally either installed in the return air grill or needs some type of filter installed just upstream if in a down air installation in a closet. If it attached to a furnace, there is a space provided by most manufactures for a filter installed just before the air return. If the furnace is in the attic or in a crawlspace, I never install a filter in these areas, but put a return filter grill in the return path.
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Feb 10, 2015 | Goodman Heating & Cooling

1 Answer

Goodman furnace


Sounds like the furnace is tripping off on a limit safety, either temperature or air switch. Check filters and restrictions to air flow (furniture over return air grills, blocked filters) also, check the drainage line of the system. If the furnace can't drain water fast enough it will back up internally, and trip the system off on a pressure switch safety.

hope this helps.

Mar 18, 2014 | Heating & Cooling

1 Answer

Goodman furnace, blowing cold air


Replace termorelay cose it overheating in service centre 12_26_2013_5_48_58_pm.jpg

Dec 06, 2013 | Heating & Cooling

1 Answer

Goodman heating system


It really depends on the type of system you have. You will either have a furnace, high efficiency furnace, heat pump system, heat pump with gas or electric back up heat. All these systems operate differently and the problem that you are having could be caused by multiple issues, depending on which system it is. More info will be greatly appreciated. Make sure to check all filters and air flow first before going any further. The system could be over heating and tripping a limit, causing the system to stop producing heat until the unit has cooled back down.

Dec 06, 2013 | Heating & Cooling

1 Answer

I have a GMPN080 horizontal gas furnace in attic of my home. What is the purpose/function of the drain trap assembly in furnace. Cooling coil is external to furnace?? Please advise, looks as if someone has...


The reason for the trap is to compensate for the negative pressure the drain line is under. Since the blower is pulling the air, if the trap wasn't there, then the drain wouldn't drain properly.

By having a trap, your blower is pulling air back through the trap while the condensate water is allowed to flow and drain.


With that being said, if you have water forming in your emergency pan, its an indication that the main drain line is clogged up. If you know where the drain line exits the home, take a small shop van and vacuum out the drain line. If its really backed up, it will sound like a golf ball through a garden hose.

If your trap has a clean-out installed, I would recommend pouring some hot water and bleach combination down the trap itself after you have cleared and flushed the drain. The bleach will assist in killing any mold/mildew that has accumulated in the drain.


Also, while your in your attic, ensure your emergency pan has a float switch and that its operating properly.


Jan 11, 2010 | Goodman Heating & Cooling

1 Answer

Heater keeps going off on its on also fan not


Please provide more info. When it goes off does it come back on by itself or do you have to flip a breaker? Is the furnace gas or electric? If it is not moving enough air across your heat exchanger in a gas furnace or across electric heating elements this will trip a safety switch that will stop heating but not fan. Low air speed is most likely from inexperienced or improper duct design/ installation. Duct sizing is very important to move enough air. Don't believe me try breathing thru a straw. If your unit is a gas furnace it has a flashing code that will tell you what is wrong codes listed inside unit door. Could be lots of things. Reply with more info.

Dec 04, 2009 | Goodman Heating & Cooling

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There is water leaking from the bottom of the new gas furnace. This happend last year and they said a hose was plugged. It is happening again this year and they are saying now it is because we didn't have...


No. The installers did not properly plumb you hose. You have a high efficient furnace which is really nice. However, this furnace takes out moister from the air when heating, causing condensation. I would look at the installation manual and see if they installed them properly. They might of installed the wrong unit for you home. Most Goodman furnaces can only be installed up-flow meaning in the closet or horizontal installed meaning in the attic. Look at the installation manual to see if they installed the right unit for your home. www.fastacservice.com

Oct 13, 2009 | Goodman Heating & Cooling

1 Answer

I have a Goodman electric furnace model ARUF049-00A-1. It seems to run constantly and emits an odor of sewer through the air ducts


Can you view inside to the electic heaters and ensure they are clean? On rare occasions, insulation from furnace or attic believe it or not gets into furnace and gets cought up in the coils. It could possibly ruin your sequencers, you'll have to have a tech replace those.

Dec 05, 2008 | Goodman Heating & Cooling

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