Question about Goodman GMS90703BXA Heater

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Condensation running down old vent pipe running to roof.

Vent pipe from old furnace was left in and the new PVC pipe has been run up through it . We are getting condensation running down the old metal vent pipe and can't seem to stop it.

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  • dwkcool May 11, 2010

    sound like the pvc was not ran out far enough and making condensation in the old metal pipe

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This is a condensing furnace and is ment to condense. You will need to pipe away the condensate using a hose and maybe a condensation pump. It is unclear where the combustion air pipe is going? Are you using room air? or do you have a second pipe going up the old vent as well?

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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Trouble shoot Dayton gas furnace model GG9S100C16MP11A fan is left on constant but in cold weather 10 or colder fan will go off and furnace will go thru a restart mode and run fine for awhile then will do...


Do not run contentiously during heat mode. the fan runs at a slower speed with heat and heat fires first then the fan cycles on during heat cycle then when heat satisfies the thermostat the heat will cycle off and fan will run for a couple more minutes and then cycle off. So set stat on fan cycle to auto.

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I have a keeprite furnace that is acting up the furnace starts up and runs some times for minutes and sometimes seconds the pressure switch is cutting in and out but it doesn't seem to have a steady flow...


TEMPORARILY disconnect exhaust vent and see if it still does it. If it runs for a few minutes like that, normally your problem is something in your vent pipe. If plastic vent pipe, even a puddle of water, if the pipe is not sloped correctly. Water in the vent pipe has to run downhill all the way to the furnace. If metal vent, probably a clog somewhere.

Nov 07, 2013 | Heating & Cooling

1 Answer

How many BYU is a Lennox G40UH (x) series furnace? And can it be vented with PVC? Thanks alot!


The Btu rating for this furnace is 40,000. Since the furnace has a 3 /34" metal flue collar on the top of the unit, you can not use PVC pipe to vent it. Only 90+ efficient gas furnaces can use PVC pipe for venting and the also come equipped with a condensation pump, which yours doesn't.

For more information on your furnace and how it's to be safely installed and vented, here is a link to the installation manual http://www.greenwoodheating.com/products/manuals/gasfurnaces/G40UH.pdf that you can download and print.

Hope this helped answer your questions?

Mar 18, 2011 | Heating & Cooling

1 Answer

WHAT KIND OF CHIMNEY DO I NEED, A PLASTIC PIPE OR AND OLD FASHION METAL ONE GOING STRAIGHT UP THE ROOF?


Depends what kind of furnace do you have. Do you have drain coming anywhere directly out of furnace. If you do that is a condensing furnace and you should have PVC venting. (Do not count a drain coming out of Air Condition coil). If you are not sure repost with furnace model #(should be located on inside the upper door

Jan 26, 2011 | Heating & Cooling

1 Answer

Need replacement PVC vent pipe elbow with outlet drain


That's going to be a specialty item that you will have to go through the manufacturer for. Also, You will most likely have to add a coupling or two in the pipe. Once you cut the old elbow out, the pipe on each end will be shorter than what you had before. That size pipe is usually tight in place and not easy to shift around. When you purchase the fittings, you should also purchase the primer and the glue needed to do this job per code. If not done per code, it could lead to personal injury and or death as this is the pipe that contains Carbon Monoxide when the furnace is running.
This type of job appears simple but, due to clearance issues, can be troublesome for even the most seasoned mechanics/installers. I would recommend this job be performed by a licensed/qualified contractor.

I would have liked to offered a precise place to obtain the fitting and to say it's an easy job; however, it's a bit more complicated than it appears.

Here's a link to the Goodman Manufacturing with a dealer locator.
http://www.goodmanmfg.com/

Though it may not be the answer you were hoping for, I do hope you found this information helpful to you. Good Luck in your endeavor! :-)

Mar 11, 2010 | Heating & Cooling

1 Answer

Should the vent pipe be hot


If it is a single wall vent pipe and it goes into a masonary chimney that
has double wall pipe, you can expect the temperature to be over 120deg.

If it is double wall vent pipe all the way to the roof, I would say that
the pipe might be under 100 deg. I guess I would have to no what type
of vent config you have.

If you think that it is way hotter than you can recall in the past, if it has a induced draft blower, make sure it is operating. You could take the vent connection apart at the furnace and make sure it is not plugged.

If you have a water heater tied in with the furnace vent. You could take
a lighter or a match and put the flame near the water heater vent, if it
blows out than you have a problem with your vent system.

Things that could cause this is another fan operating, a gas or wood
burning stove or an attic fan. Could also be due to the chimney vent
not being above the roof line and on a windy day could cause
backdraft.

Jan 17, 2010 | Goodman Heating & Cooling

1 Answer

Goodman furnace wont come on


If this is a High Eff furnace:
1) Remove the compartment that has the igniter and burners, turn the
power back on, if the furnace lites then you have a problem with the
intake air vent, probably iced over if you live where its cold.

2)Make sure the exhaust vent is not getting backpressure from the
wind.

3) you could cut the pipes on the inside of the house to disconnect them from the furnace, test run the furnace with no pipes.If the furnace
runs then you have a problem with the installation of the vent pipes.

4) Do not run the furnace without the exhaust pipe disconnected,
go to the hardware store and get a couple of rubber clamped
couplings and hook-up the exhaust pipe!

Good Luck

Jan 09, 2010 | Goodman GMS90703BXA Heater

1 Answer

Colman mobile home gas furnace to use in my garage/shop


generally speaking a sealed combustion system is inherently more safe than a system that draws it's combustion air from it's ambient location. however, it cannot be considered 100% safe in a potentially hazardous location. The actual system that would be used in a "code compliant" installation would be a 100% outside air unit.
That being said, you can install this in a garage, the vent that you are referring to (if it is a standard mobile home system) is generally directly above the unit and usually no longer than about five feet. It also requires a listed and labeled termination "cap" If you install 90 degree angles or extend the vent too far you will have issues with condensation in the piping that will cause the pipe/ heat exchanger to fail prematurely.
If the system is a 90+ efficeint unit then the PVC venting is generally allowed to be about 30 feet long, with a 1/4 inch per foot pitch back to the unit for condensation, also the general mfg. instructions allow either 2- 90 degree or 4 45 degree fittings in the line. hope this helps

Nov 06, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Heat not coming on carrier gas pack code 31


code 31 indicates pressure switch did not close or reopened during the heat cycle....1st thing to check is the inducer motor,,this is a small motor that turns a small blower wheel that draws the exhaust gases through the furnace and blows them into the vent pipe....1st locate the inducer assembly,,most easily identified by the small plastic fan blade that cools the inducer motor as it runs..1st turn off tstat and turn off furnace power switch..then turn on furnace switch,then set tstat to heat,set the temp above room temp by 5 degrees...remove the furnace front cover,locate the inducer motor,,if it isnt turning,but is warm or hot after a minute or so,likely the inducer motor is bad..if it isnt turning and isnt warm after 1 minute,then likely the main control board is bad,,not turning the inducer motor when it should,,,,,if the inducer motor is running,,then the pressure switch isnt closing,, could be a bad pressure switch but more likely there is a problem with the venting...some possible problems that would cause the pressure switch not to close in an 80% eff furnace [metal vent pipe] are: [1] a blockage in the vent pipe,base of chimney,dead bird at the furnace where vent connects to furnace or down inside the inducer assy,accessed by removing vent pipe from furnace....if all clear the chimney could be blocked up inside,,is the draft good when vent is removed from base of chimney?..if furnace is a 90%+ type [pvc plastic vent pipe],,then check the intake pipe at the furnace by removing it where it attaches to top of furnace..is the intake clogged with anything?..then check the intake and exhaust pipes outside for blockages,,including ice/frost/snow at the exhaust pipe outlet..

Jan 26, 2009 | Goodman GMS90703BXA Heater

1 Answer

Goodman heater


OK, we will need to perform a simple test of the furnace to see exactly what is going on. Set your thermostat to 10 degrees higher than you normally do so we know that there is a call for heat. Then at the furnace, there will ba a small viewing port. Watch the blinking light and record all the patterns it blinks. After a minute or so, place your hand on the PVC vent pipe(s) to see if they are warm. If not, either the thermostat is not sending a signal to the furnace or we will need to look inside the furnace to see what is happening. But if one of the PVC pipes is getting warm, place your hand on the plenum on top of the furnace connected to the ductwork. You shoul feel the metal starting to get warm. If the blower does not turn on within two minutes, there is an issue with either the blower itself or the control board.

Getting back to if one of the vent pipe(s) don't get warm. Using a piece of duct tape or electrical tape, after removing the furnace access panel, tape the door safety switch down. The furnace will now try and cycle. A small fan attached to the vent pipe should run, then it will create suction on a pressure switch that will energize the ignitor. You will notice an orange glow thru a larger viewing port looking into the burner box. After a few seconds, the gas valve will open and the ignitor will ignite the gas. The orange glow will turn to a blue flame. Now after two minutes or less, the blower should turn on. If one of these steps don't happen, you should document it and let your technician know. As far as the blinking lights, these are diagnostic codes that will tell you where to look for the issue. On the rerverse of the access panel, there is a chart that gives a simple explanation of what the blinking represents. Again, let your technician know what you discovered. Keep in mind that the furnace will cycle or attempt to start 3 times before it will blink an error code.

Remove the tape and reassemble the access panel. Yes you will need to contact your technician but the steps you performed just saved you 30-40 minutes of diagnostic time.

Nov 24, 2007 | Goodman GMS90703BXA Heater

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