Question about Honeywell Programmable Thermostat Heater

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Hello, I have a Honeywell thermostat T8001C and al of a sudden started to reduce the temperature when set at heating. I set it at 75, it goes to 70. I even played with the HOLD button to keep the temperature at 75. Does not work. Then I took it down and when set back has no display. I toggled - as many say here - with the E-F switch and put it back on F still no display and no HEAT. If I turn to FAN ON I hear the fan kicking in, still with no display. So the unit gets power but does not turn on the heat and no display. Any help please? gtc1961@live.com

Posted by Anonymous on

6 Suggested Answers

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Posted on Jan 02, 2017

  • 579 Answers

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

  • 3 Answers

SOURCE: wiring diagram to connect programmable Thermo to Heat Pump

I don't know if this will be helpful or not, but I just installed a new Honeywell and the Honeywell customer service guy helped me get the wires done correctly. The number is 800-468-1502.

Posted on Jan 05, 2009

  • 1 Answer

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

i need help rplce thrmostat with a digital braueburn my furnance wont turn on no flashing lights cant reset the burner though has power what do i do shoul i reset the circut breaker that was never tripped though

Posted on Jan 26, 2009

  • 118 Answers

SOURCE: problem with thermostat (honeywell rth111/221).

should be installed with
1) red to rc and jumpered to rh
2) green to g
3) yellow or blue to y
4) white to w
to test: remove t-stat connect white and red - furnace should operate normally unitil you disconnect.
if it does replace t-stat

Posted on Oct 27, 2009

shastalaker7
  • 1515 Answers

SOURCE: my honeywell central heating system turns off on

Hi, Just to let you know I have repaired central Heat & Air systems for 33 years and Have seen this problem on many occasions. Lets see if I can save you so many trips.It says you have a programmable stat? On this stat and on a mechanical stat, they have what is called a heat anticipator that controls how many and how often your thermostat turns you're unit off and on and how long it cycles after the stat is satisfied. If you have ever seen under the cover of a mechanical stat, ( mercury switch type) you will see a dial with an arrow with numbers as .1, .3, .4 1.0, or .15 to 1.0 amps.Some are fixed and some are adjustable. On a digital stat, you will have to get into the program and see what the heat anticipator is set on. They come from the factory at .4, but to really find out what you'res should be it takes an amprobe to do this. The setting you need is what you're gas valve requires.I am sure I have lost you, but I am just giving you a little food for thought. If you can get into you're program and set this to .4, great. If the problem continues, your anticipator on this stat is more than likely, shorted, which would require you to buy a new stat.With a shorted anticipator, it will seem to be working like you say, but when satisfied, the temp.keeps falling until you reset power, then it fires and repeats this. Change the stat. If this is central heat and air, just follow red-rc which will have a red jumper to rh for heat, white to w, green to g=fan, and yellow or blue to y = cooling. If you have central heat only, you will find 2 wires red and white.Red to rh with jumper still installed to rc and then white to w.This is quite a long explanation, but I wanted you to know a little more then the next guy about your stat. Please let me know.
Sincerely,
Shastalaker7

Posted on Nov 12, 2009

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