Furnace cutss off before temperature is reached

Hi,
Our furnace blower stops before the set temperature is reached. Got a brand new thermostat
and the same things happens. It will not restart until the Heat/Cool/Off control on the thermostat
is placed in "Off" and then placed on "Heat", even if the temperture drops well below
the set temperature. What need to be changed?
thanks Ken
--
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Your service tech
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wrote:

Ken, Its almost always the thermostat. They are made so cheaply now that it usually takes 4 or 5 replacements until you get one that works correctly. Replace it again. Bubba
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Ummm, would you really want a thermostat made by a company that makes such a high defect rate like that even if the one you got happened to work? A thermostat is something where you should go out of your way to get a good one (not whatever they happen to have on ths shelf at Wal-Mart or Home Depot that's cheap).
I also suspect it's a limit switch inside the furnace.
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On Wed, 21 Nov 2007 11:39:05 -0800 (PST), snipped-for-privacy@gmail.com wrote:

Caught myself a big one, eh? :-) Bubba

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Mine does it same way I even try Viagra but that did not help Tony

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Ken wrote:

How old is your furnace?
Look on this page:
http://toad.net/~jsmeenen/anticipator.html
There are 2 pictures. The second one is a picture of a thermostat (the furnace fan-control thermostat) that's mounted to the heat exchanger inside a furnace (in this picture the cover was removed from the thermostat). Do you this on your furnace?
The round plate with a slot in it rotates based on the temperature inside the heat exchanger. It's what turns your furnace fan on and off, and also has the hi-limit switch.
Your problem could be that your fan is cooling down your heat exchanger to the point that your fan is turned off even if your burners are still going. This could be caused by an incorrect Fan-Off setting, or maybe you need a new furnace fan-control thermostat.
Alternatively, you could be hitting the hi-limit, which means that the temperature inside the heat exchanger has reached the hi-limit setting of the fan-control thermostat. When this happens, the burners are shut off, but the fan will (or should) keep running until it reaches the Fan-Off setting.
What you should do next is go and watch your furnace (take the front cover panel off) and see if your fan turns off while the burners are still on, or if the burners turn off (but the fan is still running).
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Dude you are a serious retard.
--
ur sofa king we Todd did

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HVAC Guy wrote:

You're so fucking funny HVAC Gay Guy! Why don't you try giving tips on fixing cars? You just as good at that as you are an HVAC engineer.
--
Zyp



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It's possible that a safety of some sort is being tripped. There are many other possibilties. If you're not really handy you probably should call someone to take a look at it

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