HELP! Furnace blower not working right.

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Old 02-14-13, 09:54 AM
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HELP! Furnace blower not working right.

My furnace stopped working 2 days ago. I think I have narrowed it down, but I am hoping for some of your expert opinions. From what I can see, when it is time for the blower to start to spin it just twitches for a second and never spins. I can reach in and give it a spin and it will start and spin normally. It spins freely without power. The control is giving different codes... open and closed switch. So far I have replaced the capacitor. I have searched the forums and was hoping for some the expert opinions I see on hear. Thanks!
 
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Old 02-14-13, 09:57 AM
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additional info

When i said that it spins after I spin it by hand, I meant that the motor takes over and will run for and hour or so.
 
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Old 02-14-13, 10:16 AM
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Additional info

Thought I would be clearer on the codes. It mainly shows LOCKOUT CAUSED BY FLAME SENSED but sometimes shows HIGH AUX. or SPILL LIMIT SWITHC OPEN and PRESSURE SWITHC STUCK OPEN.. and once REPLACE CONTROL... I replaced the control panel 2 years ago.
 
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Old 02-14-13, 12:57 PM
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<<
but sometimes shows HIGH AUX. or SPILL LIMIT SWITHC OPEN

Read more: http://www.doityourself.com/forum/gas-oil-home-heating-furnaces/488643-help-furnace-blower-not-working-right.html#ixzz2KuQIXQDH>>




Very likely this diagnostic code is caused by the failure of the fan motor that circulates air around the house to turn on. If it fails to start, the furnace will overheat, causing the limit switch to shut off the burners and cause that diagnostic code to be displayed.


I'd use a multimeter to check the AC voltage to the fan motor to see if the 120 VAC is being supplied to the motor and the motor isn't starting or whether the circuit board is failing to switch on the AC voltage to the motor properly and reliably.
 
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Old 02-15-13, 11:45 AM
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Blower problems

Thank you for your response Seattle, I suspect the blower also. I have no experience or own a multi meter. Can i just buy one and give it a shot? Can I just get one from Wal Mart? Do i test the leads connected to the wires coming from the board going to the blower?
 
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Old 02-15-13, 03:36 PM
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I would look for a friend, neighbor or relative with some electrical experience to help you check out your problem. Multimeter can be obtained pretty cheaply at Home Depot, Radio Shack or many other sources, but trying to diagnose a problem with zero experience is not a good idea, in my opinion.

With someone else to explain how to check out a problem and use the meter, you might begin acquiring the experience that would let you deal with electrical problems in the future.
 
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Old 02-16-13, 11:18 AM
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Blower problems

Thanks for the words of caution. I noticed another thing today about the blower. After the burner is on for 30 seconds or so, when the blower is to kick on it has been twitching like it wants to start. Usually not a lot then I give it a spin and it will start. Has been a way to get heat in the house. Today it moved more the usual like it was going to spin on its own. The thing is, this time I could see it was trying to spin the wrong way?!?! I am going to test for volts, but could this be a board problem still? I replaced the board 2 years ago.
 
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Old 02-16-13, 06:10 PM
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Have you checked the brushes in the motor? Worn brushes could cause the twitching.
 
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