furnace blower sticks on

Posted by Stormin Mormon on November 6, 2009, 8:23 am

They are not made to be dissembled. Have to take the whole
fan limit switch out, and replace.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

Thanks for the advice Bob. Where are the contacts? Do I
likely have
to take the fan/limit control off the furnace or take the
whole thing
apart? No problem doing that, I just want to know what I'm
looking
for.

Thanks

Posted by Mikepier on November 6, 2009, 6:47 am

> I have a York Stellar furnace that is 16 years old. =A0After the heat
> cycles on and off, the blower will occassionally stay running. =A0If I
> tap the fan/limit control very lightly the metal disk unsticks,
> jiggles a bit, and then the blower shuts off. =A0Then it may work fine
> for a few cycles, but sooner or later it will stick on again and need
> to be tapped. =A0I assume that this is the part that needs to be
> repaired, but is it pretty easy? =A0The fan/limit control is a
> Honeywell, so I assume I can find the model/part# and get a
> replacement or just take the old one in. =A0I've attached a pic athttp://=

img199.imageshack.us/img199/2626/img1509fo.jpg

> Thanks!

Hard to tell from the pics, but is your low limit set on 50? That
should be bumped up a little bit. Otherwise you are blowing 50 degree
air in your house. Maybe that is your problem, because the fan will
not shut off until the plenum cools off to 50 degrees. Try 75 degrees.

Posted by Colbyt on November 6, 2009, 7:39 am

>I have a York Stellar furnace that is 16 years old. After the heat
> cycles on and off, the blower will occassionally stay running. If I
> tap the fan/limit control very lightly the metal disk unsticks,
> jiggles a bit, and then the blower shuts off. Then it may work fine
> for a few cycles, but sooner or later it will stick on again and need
> to be tapped. I assume that this is the part that needs to be
> repaired, but is it pretty easy? The fan/limit control is a
> Honeywell, so I assume I can find the model/part# and get a
> replacement or just take the old one in. I've attached a pic at
> http://img199.imageshack.us/img199/2626/img1509fo.jpg
> Thanks!

You may not be able to get the exact part but a universal replacement part
can be purchased.

First I would move the low limit up to about 80 or 90 degrees like another
poster suggested.

Colbyt

Posted by Eric on November 6, 2009, 8:00 am

I'm with some of the other posters here... I think the control is misadjusted.
That little metal
tab sticking out near the "50" marking controls when the fan turns on and off,
and can be moved. 50
is way too low a setting, it should be closer to 100. The "Off On" markings
under the word "Fan"
indicate the range where that is supposed to be.

Eric Law

Posted by Matt on November 6, 2009, 8:18 am

> I'm with some of the other posters here... I think the control is misadju=

sted. =A0That little metal

> tab sticking out near the "50" marking controls when the fan turns on and=

off, and can be moved. =A050

> is way too low a setting, it should be closer to 100. =A0The "Off On" mar=

kings under the word "Fan"

> indicate the range where that is supposed to be.
> Eric Law

Okay, sorry I should have clarified before. I took the pic at a point
where I was experimenting with the adjustments. The metal tabs are
usually set around 130 (high) and 80 (low). I had pushed the lower
one down to 50 so that I could slowly move it up and see at which
point the blower shut off. The problem is that when it does stick, it
requires only the slightest touch to un-stick - so it's impossible to
hold the dial and move the tab without manually "unsticking" it. The
issue is definitely not the setting, since when I have it set on 80,
the blower continues to run until I manually unstick it - at one point
i was out of town and my wife said it ran for 2 days straight, and
upon coming home and measuring the temp of the air in the plenum, it
was much lower than 80.

So really I either need to replace it or file the contacts. I'd like
to try the filing, but can anyone tell me where the contacts are? If
I do need to replace it, can anyone tell me if it's a straighforward
replacement job?

Thanks

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