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I have my thermostat set for 70 deg but sometimes the furnace continues to heat the house up to 78 deg. Is this something wrong with the furnace or the programable thermostat?

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Defective thermostat, If cooler air strikes the thermostat, this will set off the heat to come on.

Posted on Apr 01, 2011

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Furnace keeps running when set at 78 but only gets up to 75....we have an outdoor wood burner that is hooked up to it and that is our heat source....


Sometimes thermostat settings are not right on the money. In your case it could be that the furnace is accurate but the house temp could be lower due to a number of reasons. People going in and out, bad insulation, window drafts, or just the thermostat being out of calibration. I think you are just fine with only a 3 degree difference. GOOD LUCK FRIEND.

Nov 18, 2014 | Heating & Cooling

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I have a Braeburn 3200 and when the the temperature reaches the desired heat setting. The furnaces heat will shut off, but the fan will continue to run indefinetly. eventually blowing very cold air up


The fan relay is stuck in the on position. When the temperature drops the heater does not ignite because the fan is already running and ignition is locked out after the heat cycle starts an the fan turns on

Nov 16, 2014 | Heating & Cooling

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Fraser Johnston Furnace - Not heating


Check the furnace filter to make sure its not dirty . Dity airvfilters can cause the furnace to overheat and shut off on a high temperature limit switch when the switchs cools down it resets but the furnace has to be shut off to reset the control board. Hope this helps.

Jan 23, 2014 | Heating & Cooling

1 Answer

What's your problem? I have a Airtron furnace/air cond unit and last night I smelled a odor that of something electrical burning. I also noticed that the heating unit stayed on and continued to blow...


I'm willing to bet a relay burned up. You likely have your tstat set to auto changeover, meaning it automatically goes from heat to cool to maintain desired set points??

Jun 21, 2017 | Heating & Cooling

1 Answer

We have a new a/c and the system has heat strips. For a/c. we have had the thermostat set on AC at 72degrees. Now that it is getting colder and may need some heat in the house, do we switch the...


If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
Hope this helps.
SeagullAC

Sep 15, 2011 | Heating & Cooling

1 Answer

I turned my thermostat down this morning to 68 degrees. I came back about 2 hours later to increase the temp to 70 degrees but when I push the ^ arrow instead of showing the increase to 70 it just flashes...


Since it's within 2 degrees of your setting it could be one of two things. Most furnaces run longer (pass your setting) to maintain the setting you made. Which really not a problem. However, your thermostat may need calibrating. To test this theory, place a regular wall thermometer next to your furnace's thermostat and see if the two temps match when the furnace cuts on and then when it cuts off.
If the temps are both the same, the furnace thermostat is fine.

If you're turning it down to 68, because no one will be at home during the day, just set it 2 degrees cooler than 68 degrees. You will then wind up with 68 degrees.

Feb 09, 2011 | Heating & Cooling

1 Answer

Thermostat issue with comfort zone II.


Is this an electric or gass furnace - Eather of these can can have this problem its most recomendable that you call a seviceman .
in the case of electric furnace you may requier a new heat sequencer. And in the case of gass you may requier a new relay.

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Thermostat seems to be working, furnace does not always turn on


Joss sounds like the anticipator setting on thermostat i would replace it with a digital it will be more actturat . The furnace has to go over temp setting to turn off

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Furnace will not shut off


something is wrong with the thermostat.  replace it first, that would be the cheapest alternative

Nov 23, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

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Is the heater staying on all the time? Most likely cause of themostat trouble is the sensor. Try to find it and measure its resistance at different temps to verify the trouble.

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