Question about Honeywell Programmable Thermostat Heater

3 Answers

Furnace kicks on every 15 mins

I have a Honeywell round manual t-stat and my furnace kicks on ,runs 5 mins, kicks off and comes back on again in about 10 mins. Is there a control on the t-stat that I can regulate. The furnace is gas forced air and is in a cold attic.

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  • HANK MCNEIL May 11, 2010

    yes, there is an antisipator adjustment in the tstat. What brand and model furnace do you have?

  • dwkcool May 11, 2010

    on the t-stat cross the red and white wire if the furnace runs see how long if it does the same thing it is in the furnace

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Fuanace may be oversized and is short cycling it heats up house to fast it is better when they run longer

Posted on Oct 04, 2009

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HI it could just be your thermosat try cleaning out could be dusty or try repacing it

Posted on Feb 02, 2010

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Older style thermostats have a heat anticipator, which may be set incorrectly. The purpose of the heat anticipator "lie" to the thermostat, taking care of overshoot and lag. The heat anticipator should be set to the amperage listed on your gas valve

Posted on Jun 18, 2009

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1 Answer

I have installed a new Honeywell CT87 non-mercury manual thermostat. It runs but the the furnace turns off the room temperature alway at or beloe the furnace setting so the furnace turns back on again and...


Hi, these mechanical thermostats have what is called a heat antcipator on them. If you remove the cover you will see in increments or numbers such as 1.0, o.1, .2, .3, .4 or o.1, 2, 3, 4, . The stat and main gas valve work together and have to draw the same amount of amps to cycle the unit properly. This stat will have a copper arrow pointing at a number. A good place to start is to set it at .4. If the unit does not cycle right, set it at 1.0 and go from there until it cycles. Let it go through several full cycles during each time you adjust it until it is correct. These are good dependable stats as I have many on my service truck. If it doesn't take care of the problem, take it back and return it for one that is not faulty which happens often. Best of luck to you.
Ps, the small manual that comes with a new stat has that information on it, anticipator settings.
Shastalaker7
A/C, & Heating Contractor

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My honeywell thermostat is asking for heat but the furnace won't turn on.


The first thing i would do is to make sure the t-stat is good.One easy way to do this is to remove stat cover then remove the screws that hold it to the wall. Disconnect t-stat wires making sure you note location. There should be a red and white wire for heat so put these two together and if your furnace comes on then the stat needs replaced. If it does not you need to check further to make sure you have power to your furnace.If the furnace does come on with these two wires together the furnace will run non stop. Hope this helps you. Thank you

Jan 12, 2011 | Honeywell Programmable Thermostat Heater

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We have a fairly new furnace. I have the temp set at 65 the furnace only runs for 3 min at a time and comes on every 5 min. This sounds extreme to me?


It depends on the differential that you have programmed into the thermostat. In most of them you can set the temperature you want the thermostat to activate, and then you set the run differential such as three degrees below 65. In other words, the thermostat will activate at 62, and drive the temperature up to 65, cut off and wait for the temperature to drop to 62, where it cuts on again. see:

http://yourhome.honeywell.com/home/Products/Thermostats/

Check http://homeappliance.manualsonline.com/manuals/mfg/honeywell/8000.html to see if you can find the manual if you have lost yours.

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My honeywell t-stat reaches current temp setting and furnace kicks off...but within 1 minute the t-stat drops 1 degree and the freakin furnace kicks on! This can't be right as it has never happened with...


Your differential is set to close you can go into tstat and change differential setting. Your install manual for your thermostat will tell you how you can set 1.2.3 degrees differential

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the power for that stat comes from the furnace - if you have no display on the stat you have a furnace problem

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1970's Rheem electric furnace


no the older rheems had a sequencer for the heat that turned on the blower at the same time that the heat strios are energized. so the first thing that you need to do is figure out the sequencer that is keeping the fan running and get it replaced.

Jan 30, 2009 | Honeywell CT3200 5-2 Day Electronic...

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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.

Feb 09, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

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