Question about Honeywell Programmable Thermostat Heater

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Honeywell Thermostat Problem

I've noticed several times this winter my heater not being on when it should be. My round Honeywell thermostat is set at 70 and this morning the thermometer read 64 (heater was not on). On these occasions, I "fix" the problem by placing the thermostat switch to OFF and then back to HEAT. The heater kicks on and warms the house. Is this a thermostat problem. Thanks...Bob Sent via # Before you buy. I have a honeywell CT2700A1019. The themostat is set at 66 and is reading 57. The blower is blowing but the air is cold.

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  • Anonymous Nov 18, 2008

    I have the same problem with my thermostat. I thought I had solved the problem by replacing the batteries on Sunday, but today (Tuesday) I had to reset the furnace by turning it off. Any suggestions? Jackie



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My round non-programmable digital thermostat doesn't seem to be communicating with the heater very well. I set it to 70 degrees and it clicks off before reaching that temperature. Any ideas?

It sounds like you may have a round Honeywell thermostat. It could be that the temperature pointer you see on the face of the thermostat just needs to be adjusted. The next time your furnace or AC finishes running, remove the face off the thermostat and use a small screwdriver to set the dial so the pointer temp matches the other temperature indicator.

Oct 29, 2013 | Honeywell Heating & Cooling

1 Answer

We have a round thermostat made by Honeywell. I

The thermostat that you have is position sensitive. By that I mean that you need to have it in the right position for it to work correctly.
When you have the ring off of the thermostat loosen the two little screws and pull the thermostat away from the subbase. On the subbase you will see a line that needs to be level. If it is not level then the mercury bulb will not be in the right position to start and stop the furnace. Level the subbase and reassemble the thermostat and your furnace should start to work properly. If not then the thermostat is probbaly bad.
When they go bad it is often becasue ot the little arm that you refeered too. That is a small heater than actually fakes the thermosat into thionking that it is hotter in the room then it really is. This makes the furnaces shut down a bit early to combat overshoot. Adjusting that will determine how much time before the furnace hits the shutdown temperature that it will actually shutdown... got that?? In others ward it is probably a good idea not tp mess with that unless you know what you are doing. However the heater can burn out and create problems.

So, check that the thermostat is level and if not get a new t-stat...

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Dec 11, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Cannot get thermostat to work with previous owners programming.

turn the power off to the thermastat for 5 min (should be a switch on unit) and it should reset

Dec 11, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

4 Answers

Cold air will not turn on

What you can do is you can go to any store for special like bottles that you put inside the AC unit to get cold air.

Thank You!!!!!!!!!!

Jun 23, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

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...

1 Answer

Honeywell T86A3006 24V Class 2 Round thermostat 8020

The honeywell tradeline thermostat would work as a direct replacement (no mercury in the new ones), however if your using just heaters and no cooling system off of it, you could Heat only thermostat from honeywell that would replace your unit as well. Both at available at Ace Hardware with the heat only unity being roughly 7 dollars cheaper.

Jan 14, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Cold air will not turn on

check your wireing make sure that you dont have the red wire touching the white

Jun 02, 2007 | Honeywell CT87B ROUND HEATING&COOLING...

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