COMMUNITY FORUM

Homeowner2

01:37PM | 02/23/07
Member Since: 02/22/07
3 lifetime posts
Bvhvac
When my furnace is done heating up my home to what the thermostat calls for, the blower will shut down, then a minute or two it will kick back on for thirty seconds or so then go off again. I'm pretty sure it's the limit causing this, but what would be causing my heat exchanger to get so hot where the blower has to kick back on?

It's a newer 80% eff. furnace, new filter, everything seems clean.

Is this common?

Thanks!

Homeowner2

03:02PM | 02/23/07
Member Since: 02/22/07
3 lifetime posts
Alrigh, a little more info. The blower ISN'T going off on limit, but this is what is happening.

My limit switch is set as follows.

Off 100

On 150

Off 200

So it goes through the heat cycle, after the thermostat is satified, the limit is around 130~, then after a minute or two, heat exchanger rises back to about 150, fan turns back on (less burners, of course) and within 30 seconds the blower cools it down below the 150, then furnace doesn't cycle until next call for heat.

Should I tighten up the parameters on the limit to around 90-120. Would this help?

Thanks

Homeowner2

08:25AM | 02/24/07
Member Since: 02/22/07
3 lifetime posts
I set it at 130, we'll see what happens.

Also, is it common for the inducer duct work to get extremly hot? I haven't taken the actual temp of it yet, but it gets so hot you can't even touch it for a secon.
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