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Furnace blower won't start....coldest night so far.

Posted by jimhokie (My Page) on
Wed, Jan 2, 08 at 18:48

I have a 15-year old Carrier gas furnace model 58DFA. Yesterday we noticed a burning smell and traced it to the furnace in the garage that was hot to the touch on the side of it. It appears that it just tried to enter a heating cycle where the burner cut on, but the fan did not, so the burner shut itself off. I tested the fan in manual mode and can hear a click sound inside the unit, but the fan would not turn on in in manual mode either. I verified that the burner does ignite also, but did not leave it on long enough to watch it shut itself off.

I called the HVAC company that originally installed it to check it out, but after about 5 minutes tops, he just said it was either an unfunctional draft inducer or board. He said this could be repaired but it would be very expensive and not cost effective, recommending replacement of the furnace instead. While this may all be true, and I do intend to replace my whole HVAC system in the spring with current high efficiency units, I wonder if there isn't a chance that it may be something relatively simple that could be the problem--don't think he really did much once he saw how old the unit was.

One internet site said my symptoms may indicate a blown fuse or bad blower motor. Where might this fuse be and how can I test the motor? If it is a bad motor, is this a cost effective repair for the moment? I'd like to take time to decide on a good investment efficiency-wise if I can just get my heat running for the moment, rather than be forced to spend thousands off the cuff, which I figure will still not have us heat for a couple days or more. We do have a ventless fireplace and an open floor plan that helps keep the chill off.

FWIW, a few years ago the blower stopped working during the summer after a thunderstorm and I traced it to the control board. I noticed a burned looking solder connection and resoldered it fixing the problem. No thunderstorm this time.

Anything ideas I can check for a possible quick fix will be greatly appreciated!

Jim


Follow-Up Postings:

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RE: Furnace blower won't start....coldest night so far.

It sounds like he's full of ... !
If the burner seems to work, the burner is probably OK. If the blower won't run, it's probably the blower.

If you have a meter or test light, you should be able to determine if the blower motor is getting voltage in the manual mode.


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RE: Furnace blower won't start....coldest night so far.

i don't know what it would cost in your case, but a couple years ago my blower motor cost me around 275.00 to have the HVAC guys replace it. i was out of town at the time, or i would have done it myself and saved over 100.00. if the price is over 3-400 to fix it, i would look at replacement now. no sense shelling out big bucks for something you plan on replacing in a couple months.


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RE: Furnace blower won't start....coldest night so far.

You stating that, you had strong burning smell is a
strong indication of bad blower motor.Should be easy enough
to test and not that expensive to replace. ( In the $300/$400 range)You might be able to get several more years out
of equipment.


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RE: Furnace blower won't start....coldest night so far.

I traced the problem to the circuit board, and it was the same solder joint on the board that had previously "burned" out. I resoldered it more thoroughly and that fixed the problem...I have heat again! Thanks for all the suggestions.


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RE: Furnace blower won't start....coldest night so far.

So you had a board problem... Try adding a supco surge protector. Use the one with the idiot light.


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