Question about Honeywell Programmable Thermostat Heater

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Thermostat set at 62 and heat will not shut off. Temp is 75

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Posted on Jan 02, 2017

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SOURCE: honeywell round mercury thermostat - heat not coming on

If you tip the mercury switch so that it makes contact and the furnace doesn't start, it isn't the t-stat. Check the connections, then start checking the furnace.
In any case, ditch the mercury t-stat (recycle it properly) and get a new programmable one if at all posible. It will pay for itself many times over by turning your heat down in the middle of the night and back up by morning.

Posted on Feb 10, 2008

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SOURCE: Thermostat temperatures not reaching preset Energy Star settings

Well with a boiler system like you have it will cost you more money to heat your house that way than if you leave it like it is. With a boiler system it takes a lot longer to heat an area than with a furnace. The best thing you can do is find a happy medium and leave it there at all times. If you read the paper work on your new thermostats they have a set procedure which tells the thermostat if you have forced air or boiler system. Do you have baseboard or in-floor heat how many zones do you have.

Posted on Jan 20, 2009

  • 252 Answers

SOURCE: have gas furnace and this winter,began having

The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.


Please rate my answer!

Posted on Mar 12, 2009

  • 92 Answers

SOURCE: My Honeywell TH4210D1005 Thermostat will not respond

well with 62 outside temp and then maybe a little solar gain and body heat you very well could be 5 degrees warmer then outside

Posted on Apr 07, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: Furnace cuts off before reaching set temp.

You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Mar 07, 2010

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1 Answer

Outside unit runs for about 5 seconds then shuts off for a few seconds. It repeats this cycle.


Put in a 5 minute time delay. It is a two wire device in line with the contactor. Sounds like it is set to 75 turns of at 74 and repeats. The tstat should have a differential of 2 degrees as well.

Dec 22, 2013 | Heating & Cooling

1 Answer

I set my 1F85-0477 thermostat to 80 but the room temp. is staying at 62 , why?


Apparently the heating unit is not working for whatever reason. A thermostat is only a switch, it doesn't provide heat.

Dec 03, 2013 | Emerson 1F85-0477 Thermostat

1 Answer

Trane thermostat is set to shut off at 75 degrees. The inside temp is 75 but the air keeps running. Why is the thermostat not shutting it down.


it may be out of calibration and is not that precise turn it up to 77 see if it shuts off. if not relay or contactor issue.

Aug 23, 2013 | Ruud Heating & Cooling

1 Answer

Temp doesn't shut down when preset temp reached. Have to do it myself. Set it for 62 for example, won't come on till I set it to maybe 70. Try to set the temp to maybe 65, doesn't shut down till we...


This is normal. It will only turn on when the temperature set is below the ambient temperature in the area around the thermostat.

Your problem may be the location of the thermostat is not ideal form the areas you are heating. this usually cause the temperature in areas vary from the thermostat to the point wher relocation of the thermostat is sometimes the best resolution.
this is often the case wher ther are multiple heating zines in a building, and one or more zones interfere with the thermostat of others,

but it also happen in single zone heating systems too.

Jan 30, 2010 | DeLonghi DCH4120 SafeHeat Ceramic Compact...

1 Answer

I have to play with thermostat to get my heating system on


You did not make it clear if the thermostat is a programmable unit or not. I am wondering if the thermostat is not set on the correct heat anticipation setting. A heat anticipater is a small heater that helps the thermostat turn off before it over shoots the desired temperature setting. If the thermostat is set for a 5 degree setting, it will turn off at 63 degrees if set at 68. If the anticipater was set at 1 or 2 degrees, it will shut off the heater at 66 or 67. Newer thermostats will only allow the thermostat to cycle 6 times per hour so if you never reach the desired temp, you have to wait 10 minutes before it will allow a call for heat. Check the installation instructions to see if there is a setting where you can get the anticipator temperature closer to your set temp. Good luck.

Dec 11, 2009 | Goodman Heating & Cooling

1 Answer

Can not get temp below 77


Is the thermostat set up for automatic change over from heat to cool? If so, the heat is probably set for 75, you will need to lower the heat setting in order to Lower the cooling. the stat won't let these settings with in 2 degrees of each other so the heating and cooling don't fight each other.

Aug 25, 2009 | Heating & Cooling

1 Answer

My Honeywell TH4210D1005 Thermostat will not respond


well with 62 outside temp and then maybe a little solar gain and body heat you very well could be 5 degrees warmer then outside

Apr 06, 2009 | Honeywell TH4210D1005 Heater

1 Answer

Have gas furnace and this winter,began having


The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

However - the problem is probably not with your thermostat but with your furnace. It is most likely a dirty flame sensor - a maintenance issue. If you have not had your furnace serviced recently (more than 1 year) that is where you should start. Modern furnaces require regular maintenance.


Please rate my answer!

Feb 28, 2009 | Honeywell Electronic Programmable...

1 Answer

Honeywell T87f 3855 Doesn't Activate Heater


thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Jan 25, 2009 | Heating & Cooling

1 Answer

Edgestar 12000 heating problem


bad thermostat. the stat can be as must as 5 degrees off. try, if possible testing the unit in a differeent location

Dec 24, 2007 | EdgeStar Portable Air Conditioner Heater

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