Ask Experts Questions for FREE Help !
Ask
    JPeterson's Avatar
    JPeterson Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 27, 2006, 07:45 PM
    Gas Furnace Fan won't work
    My American Standard furnace fan won't turn on. It will ignite, when it gets to the blowing stage it will turn off.
    All breakers check out fine. Can't find any other on/off switch inside unit.
    A burnt smell comes from vents, the same smell of when you first turn of the heater for the first time after summer, (not the first for this year). Was working fine before this.
    What else can I do at home, or is it time for a tech?
    Jim
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member
    		  
    #2

    Dec 27, 2006, 10:13 PM
    There are several things that could cause this. Can you check to see if there is power getting to the motor. If there is then I would suspect a bad motor, if there is not power to the motor I would expect maybe a fan relay or a limit switch.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #3

    Dec 28, 2006, 08:09 AM
    How old is it, and how long does the gas stay on? If the gas is going off only seconds after it comes on, it is the flame detector. All furnaces will shut the gas off when a limit switch opens, if the blower doesn't come on. A newer furnace uses a timed delay, and the older ones a lower limit switch. Do you have a fan on position? If so, try starting the furnace with the fan on. Often they use a different relay and a higher speed winding for fan on and cooling. Check some of the other threads and post back with more details. Quite often these things are something a homeowner can fix themselves.

    To do simple checks like this you do need some tools. A test light, a meter, or a voltage detector might be the best place to start with. I came across the niftiest gadget for trouble shooting, a voltage detector. They work through the insulation of wires. There are several brands. I have a GB Instruments GVD-505A, less than $15 at Home Depot. Touch it to a hot wire, and the end glows red. Find the doodad that lights it on one side, and not the other, and you have the culprit. You do not have to open up housings and expose electrical contacts. You are looking at where your hand is, not where the meter is. Most people are capable of doing repairs and will get it going and not get hurt if they use a little sense. The voltage detector makes it even easier.
    mr.yet's Avatar
    mr.yet Posts: 1,725, Reputation: 176
    Ultra Member
    		  
    #4

    Dec 28, 2006, 08:14 AM
    Check the thermo limit temp switch for the bonnet air.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #5

    Dec 28, 2006, 06:37 PM
    Quote Originally Posted by mr.yet
    Check the thermo limit temp switch for the bonnet air.

    What??
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Gas Furnace needs reset button pushed to work [ 1 Answers ]

1983 - Natural Gas - Rheem Furnace Model #RCDA-100C-ER Originally the furnace blower would not come on. I called a technician who pushed a reset button. He mentioned something about the air fuel mixture and that a gust of wind could have tripped the furnace off. Pushing the button worked for...

Comfortmaker Furnace Fan blows in line fuse and will not allow furnace to work [ 1 Answers ]

I have a Comfortmaker Furnace (approximately 1998/99) and the fan will not turn on allow the furnace to heat. When I try to turn the furnace on it blows a 3 amp fuse at the blower motor. I removed the fuse and jumped it and all it will do is make a faint buzzing noise and not turn on. I can...

GMC Gas Furnace Fan Won't Run [ 3 Answers ]

Hi, I have a friend with a GMC gas furnace that will not start. We are receiving a three blinking LED code that says pressure switch failed to close. We found this switch on the main air fan and discovered the fan will not run in auto or manual. We checked for 120 VAC output on the circuit board...

Gas furnace fan turns on but nothing comes out [ 1 Answers ]

When I turn on my gas furnace, the pilot light comes on, but goes off afer a couple of minutes after having produced nothing. When I turn on the manual fan, it starts up, but no air comes out. Any ideas? Thanks

Fan Doesn't Work When Furnace On [ 3 Answers ]

If I have the furnace on and the fan on "Auto" the fan never comes on. The furnace seems to work fine - the ignitor begins to glow, gas comes on, and burners light. After a while the gas stops for a time (before coming back on) but the furnace seems to run continuously If I turn off my furnace...

View more questions Search