Furnace works, but blower stopped

ed3120

I have a Heil Model #NTC6100KFG1 furnace, as shown here:

http://parts.sears.com/partsdirect/p...&prst=&shdMod=

Yesterday, I noticed that the house was cooler than usual, and the blower is not turning on. The furnace itself still has power and turns on (it still gets hot), but the blower does not. The whole house humidifier attached to the furnace still has power and works properly. My thermostat is still set to “Heat” and the fan setting is still set to “Auto”, as it always is. Temporarily setting the fan switch to “On” did not change anything.

How do I go about troubleshooting this? I assume I need to check the blower itself to ensure that it can spin. Are there other sensors or wires that I should be checking for voltage or continuity?

Thanks for any help,
Ed

Missouri Bound

Do you have a meter and are you comfortable working inside the control panel of the furnace?

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ed3120

Unfortunately, that did nothing.

Missouri Bound

??

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JJboy

Don't leave furnace on. If the blower motor is not running the high limit switch can damage. On the thermostat select Fan on and check if the blower motor will work.

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**Always kill the power ** Hot air rises, but heat will always move from higher to lower temperatures. ** Real man shoot in manual. ** If it ain't grounded, it ain't dead.

joecaption

What did nothing?
What have you checked as far as incoming power goes?
Tested the capisitor?
http://www.ehow.com/how_2072923_test-capacitor.html

Missouri Bound

That furnace has a timer which control the blower function. Can you verify that it is putting out voltage to the blower when the furnace has called for heat? There are also limit switches to consider. Can you troubleshoot this furnace?

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ed3120

Sorry, I got mixed up there.

I have a voltage meter and I know how to use it. I haven't checked anything with it yet.

Missouri Bound

I would test the blower motor if you can. Disconnect it from the board and supply power to it. If you wind up needing a board it will be $100 plus.

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ed3120

The blower runs when I plug it into AC. I checked for AC voltage on the circuit board where the blower is plugged in. I get nothing. I'm guessing the board need to be replaced.

Missouri Bound

Maybe. Make sure there isn't a limit switch locking out the board. You say the furnace does fire though, correct? What about the switch on the blower door...did you override that when checking the board for voltage? The door off will shut down the unit.

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ben's plumbing

when you say you get no voltage to motor leads on board...is the relay even pulling in ..or not ....sounds like board..ben sr

ed3120

Yes, the furnace does fire. Yes, I need to hold in the door switch to make it fire. Without the door switch held, nothing works. With the door switch held, the furnace ignites, but the blower still doesn't go on. Even after waiting a few minutes (factoring in the delay).

ed3120

I heard a click at one point, but I'm not really sure.

Missouri Bound

I'm leaning towards the control board. If you need help finding one, just ask.

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