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Old 09-25-2006, 08:34 PM   #1 (permalink)
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Furnace Tech: The blower won't stop blowing

ok... what would cause this.

furnace kicks on
furnace heats house
temp is reached
burners turn off
blower keeps running, and running, and running......

Obviously the furnace got the signal to stop running since the thermostat signaled it to turn the burners off. why would the fan keep going?
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Old 09-25-2006, 08:40 PM   #2 (permalink)
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Originally Posted by Travis Waldher
ok... what would cause this.

furnace kicks on
furnace heats house
temp is reached
burners turn off
blower keeps running, and running, and running......

Obviously the furnace got the signal to stop running since the thermostat signaled it to turn the burners off. why would the fan keep going?

Appx. age of equiptment? Most likely a blower limit switch.

Make and model and I could probably tell you for certain.
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Old 09-25-2006, 08:46 PM   #3 (permalink)
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you need your heater already?

I was overjoyed cause I could actually turn off the a/c and open the windows for the last 2 days
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Old 09-25-2006, 08:47 PM   #4 (permalink)
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you need your heater already?

I was overjoyed cause I could actually turn off the a/c and open the windows for the last 2 days
Me too! I was almost giddy yesterday!
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Old 09-25-2006, 08:50 PM   #5 (permalink)
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just jam a stick in the fan - that should stop it
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Old 09-25-2006, 08:52 PM   #6 (permalink)
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just jam a stick in the fan - that should stop it

Yup that'll work
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Old 09-25-2006, 08:57 PM   #7 (permalink)
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Chances are it probably needs a thorough cleaning. I suggest calling out a repairman, then watch everything he cleans so you know what to do in the future(annually). It doesn't cost much.

A couple years ago, my fan would run but the furnace wouldn't kick on. Turned out to be a bad connection on the main plug on the board. Repairman said it was very common on my model. Calls for replacing the board, but we got away with just twisting the plug around so there was some tension on it.

We had to kick ours on a day last week
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Old 09-25-2006, 09:17 PM   #8 (permalink)
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It's a lennox GR12Q3E-110-4, made sometime between 75 and 79? The ansi sticker shows 1975, the wiring schematic shows 1979. Those are the only dates I have.

It's still pretty clean on the inside, I checked it out while I was down there. Filter has a little dirt on it, but is still "ok". I need to replace it, but I doubt that is the problem.
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Old 09-25-2006, 09:23 PM   #9 (permalink)
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Damn, that's a pretty old furnace. You might want to consider something newer and more efficient.

Even so, there are parts that need to be removed and cleaned with a wire brush. Since you've been in your house a couple years now, it definately should be done reguardless of what the problem is.
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Old 09-25-2006, 09:32 PM   #10 (permalink)
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also, I turn the breaker off to the furnace, and turn it back on.

Blower motor comes back on.

Shush on the old furnace, it still works, and if I put a new one in, the wife will want AC installed at the same time. Besides it's probably a ~$20 part that will fix it.

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Old 09-25-2006, 09:41 PM   #11 (permalink)
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I had the same problem so I called my neighbor ( furnace guy) in the middle of the night.

he told me to look just above the burner on the face for a sqaurish type box switch with incremental marks on it and two wire coming out of it. Fan limit switch.... I found it. It had a setting arrow ( dial type device) where you could set fan times.
He told me to whack it hard with my hand and call him back in the morning.

whack... fan shut off and worked for years. Contacts were sticking ......It was a 125,000btu lennox from 1976.

called him back in the morn and thanked him.
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Old 09-25-2006, 10:22 PM   #12 (permalink)
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Sounds like a bad fan limit switch. On a safety note, if you don't already have one get a CO detector.

What it does: Turns the fan on when the air stream reaches a certain temp(could be adjustable or fixed).

More importantly in your case..

What it's also supposed to do is turn the fan off after the call for heating is satisfied and the heat exchangers have cooled enough that they won't crack from sitting in a hot state. Hence the limit. Only runs the fan from XXX to XXX.

Shouldn't be to hard to find, and relatively inexpensive to replace.

Do you have a wiring diagram? If so trace the wire from the blower back to the culprit. Note the setttings if it's adjustable and replace.

Or just smack it with an insualted tool and hope the contacts open and the fan stops for the time being
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Old 09-25-2006, 10:36 PM   #13 (permalink)
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I do have a wiring diagram.

But I gave the control box a light wack and the fan shut off.

If it continues to be a problem I'll actually fix it.

Last edited by Travis Waldher; 09-25-2006 at 10:38 PM.
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Old 09-25-2006, 10:40 PM   #14 (permalink)
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Quote:
Originally Posted by Travis Waldher
I do have a wiring diagram.

But I gave the control box a light wack and the fan shut off.

If it continues to be a problem I'll actually fix it.

You're welcome. It will be a problem. Kinda like points that old in a distributer. Eventually they fuse and you're stranded, or in this case, stuck with no heat.
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Old 09-25-2006, 10:40 PM   #15 (permalink)
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Fan/limit switch is stuck/bad. If you aren't going to replace the furnace, just get a new one to buy some time. Or if you're looking for the cheap fix, pull it out and clean it. Sometimes they work for a while after cleaning them and just working them a little bit to get rid of the "groove" they start to ride in after 20+ years. They're easy to replace, just note the on/off settings for the fan to somewhat match what you're used to. Start saving your pennies, the day you need to replace is coming. Lennox furnaces are actually probably the only thing that they make that's worth a shit IMO.
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Old 09-25-2006, 10:55 PM   #16 (permalink)
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Not too worried about replacing the furnace. I can do that myself, even install the AC.

Granted, I'm sure it'll still cost me a couple Atlas's. LOL
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