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Furnace not heating enough


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7 replies to this topic

#1 JerrisH

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Posted 10 December 2006 - 07:21 AM

As far as I can tell, everything is working, but the furnace does not put out hot enough air. It takes forever to raise the house temperature only a few degrees and the air coming out of the vents is only slightly above room temp. The unit is a Goodman forced air gas furnace. I can see the burners working when it runs, the exhaust from the "draft inducer" is very hot. I am obviously not an expert and may misuse terminology accidently. I do not think that  there is a leak in the duct  work because the attic isn't  heating up, but I haven't investigated it thouroughly yet. I'll appreciate any advice. Thanks.


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#2 Samurai Appliance Repair Man

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Posted 10 December 2006 - 02:54 PM

Changed the furnace filter lately? Starving the circulation fan will certainly create this condition. Speaking of circulation fan... have you verified that it's running? Motors can seize, belts can break... never know what you'll find. Do tell.

#3 JerrisH

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Posted 10 December 2006 - 05:56 PM

I have verified that the circulation fan is running, but air flow does seem to be slightly less than I remember.  I haven't been able to find the furnace filter. There is an air filter in the house, just inside the return vent, but I haven't seen any other filter in or around the furnace. Other webpages have led me to believe that it would be inside the unit, close to the blower, but I never found one in there. Either its missing or I'm just not looking in the right spot.


#4 Samurai Appliance Repair Man

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Posted 11 December 2006 - 05:10 AM

[user=16595]JerrisH[/user] wrote: 

I haven't been able to find the furnace filter. ...Either its missing or I'm just not looking in the right spot.

Using my psychotic powers of appliance divination, I see that your furnace filter is clogged with a thick mat of dog hair, lint, mites, human skin, and, oh my, what's this, looks like a rat's nest, hang on, lemme take a closer look.... OMG! it IS a rat's nest!  You need to find that furnace filter ASAP!


#5 JerrisH

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Posted 11 December 2006 - 07:28 AM

I appreciate your help. I spent some time looking for the furnace filter today, but no luck finding it. I've checked pretty much everywhere that doesn't require me to remove ductwork. Should it be on the incoming air side or the out going air side of the funace? Another thing I've noticed is that when the heater was working, when it was first activated after resting a few days you could smell a very feint  smoky  odor that passed after a minute or so. Now I don't smell that anymore. Everything else seems fine burners = burning, circulating fan = circulating, thermostat = statting, motors = motoring. I also ruled out a leak in the ductwork when I tested the AC, it still come through nice and cold. Is it time for me to call a professional?




#6 hvacdrd

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Posted 12 December 2006 - 04:46 PM

 There is an air filter in the house, just inside the return vent,

Sounds like you found it here, some systems use a filter inside a single return air vent. Furnace filter or air filter it's the same thing.

and the air coming out of the vents is only slightly above room temp

Sounds as if the burners are not on at this point. Supply temperature should be 40-60F higher that the room temp.

Turn the heat on, observe the burners, they should stay on as long as you have the thermostat temp set above the room temp. Measure the air temperature at a supply register and then at the return vent and post the info here.


#7 jb8103

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Posted 13 December 2006 - 05:08 PM

[user=1]Samurai Appliance Repair Man[/user] wrote:

[user=16595]JerrisH[/user] wrote: 

I haven't been able to find the furnace filter. ...Either its missing or I'm just not looking in the right spot.

Using my psychotic powers ...

Ummm...you mean..."psychic"....right....?

First, do no harm.

#8 hvacdrd

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Posted 13 December 2006 - 05:35 PM

 Oh I remember the days of being green, just a babe barely able to feed on milk. You will soon discover how to sense the ways of the master and advance to feasting on things beyond your imagination. You must faithfully follow without question to discover the true meaning of Fermented Grand Master.

In this tidbit of wisdom "psychotic" is exactly what he means here...





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