Furnace works, but blower stopped

1820 Views 17 Replies 5 Participants Last post by ed3120, Dec 27, 2012

ed3120

Discussion Starter · Dec 20, 2012

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

http://parts.sears.com/partsdirect/...2/0912130/50024933/00001?blt=06&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

1 - 18 of 18 Posts

Missouri Bound

· #2 · Dec 20, 2012

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

ed3120

Discussion Starter · #3 · Dec 20, 2012

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

Unfortunately, that did nothing.

Missouri Bound

· #4 · Dec 20, 2012

??
:whistling2:

JJboy

· #5 · Dec 20, 2012

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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joecaption

· #6 · Dec 20, 2012

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

· #7 · Dec 20, 2012

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?

ed3120

Discussion Starter · #8 · Dec 20, 2012

Missouri Bound said:
??
:whistling2:

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

· #9 · Dec 20, 2012

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.

ed3120

Discussion Starter · #10 · Dec 21, 2012

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

· #11 · Dec 21, 2012 (Edited)

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.

ben's plumbing

· #12 · Dec 21, 2012

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

Reactions: 1

ed3120

Discussion Starter · #13 · Dec 21, 2012

Missouri Bound said:
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.

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

Discussion Starter · #14 · Dec 21, 2012

ben's plumbing said:
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

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

Missouri Bound

· #15 · Dec 21, 2012

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

ed3120

Discussion Starter · #16 · Dec 21, 2012

Missouri Bound said:
I'm leaning towards the control board. If you need help finding one, just ask.:yes:

Thanks. Just picked one up. Gonna try to install it tonight or tomorrow.

Missouri Bound

· #17 · Dec 21, 2012

ed3120 said:
Thanks. Just picked one up. Gonna try to install it tonight or tomorrow.

:thumbup: please post the results for us...we are all still learning...(at least I am)

ed3120

Discussion Starter · #18 · Dec 27, 2012

Missouri Bound said:
:thumbup: please post the results for us...we are all still learning...(at least I am)

I replaced the control board and everything works perfectly now. Thanks!

1 - 18 of 18 Posts

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