Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Honeywell round mercury thermostat - heat not coming on

Our honeywell thermostat, 3 years old, no longer turns on the heat. temp has dropped to 62 and it is turning much colder tonight. we don't believe it is broken. is there something we can look for, or jiggle, or anything that might 'jump start' the thermostat? a 're-set' button? Help!

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  • Anonymous Nov 24, 2008

    I have the same problem. My radiated heat won't go above 70. Not like I need it any higher... When I move the t-stat to 60-65 then the Zone valve kicks in, and it cools down. But, If i move it any higher than 70, like to 75 or 80...after 4 hours it's still the same temp! What do i do??

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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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Posted on Jan 02, 2017

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Round honeywell thermostat


Sounds like you have a T86 thermostat...take the round front cover off to view the Mercury switch. Watch the bulb when you change the temperature to a higher setpoint. If the bulb makes contact when rotating it up, and the furnace doesn't go into a call for heat, then it could be the thermostat, wiring, or furnace problem.

Dec 13, 2013 | Honeywell Heating & Cooling

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Programmable Honeywell


A Programmable Honeywell Thermostat is a great investment for you to make for your heating and cooling system. A Honeywell Thermostat will provide you with the best in comfort and dependability for many years.

Many people when they think of Honeywell Thermostats think of the old round T87 thermostat that has been one of the most common thermostats for years and years.

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Today they have those thermostats in designer colors and they are still made and used in many situations. But the manual thermostat is quickly becoming a thing of the past. With the rising costs of fuel the Programmable Honeywell Thermostat is becoming more and more popular. Programmable Thermostat Honeywell is even one of the most popular searches when it comes to thermostats.

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The VisionPro thermostat line has quickly become one of the leading digital programmable thermostats on the market to today. The ease of programming this thermostat and the touch screen interface has made it a very popular choice for many people. There is a variation of this thermostat for virtually any possibility that you can think of. The FocusPro line also is a very good choice at a bit less cost. There is a basic Pro line and also even a digital thermostat in the traditional round configuration. Both digital programmable and basic digital thermostats are available for line voltage control of electric heating.

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Along with the thermostats you now are able to add remote outdoor sensors as well as install you thermostat in a remote place and run a sensor to the space you are controlling. For many years these capabilities were standard for commercial thermostats, but now they are a very real possibility for home use also. With an outdoor sensor these thermostats now have the capability to turn off your heat pump and start you backup heat a certain preset out door temperature. In the past many systems have been installed with complicated electronic to do what a thermostat can do very easily.

The Programmable Honeywell Thermostat has come a long ways in the past few years. The changes have made this thermostat capable of doing many unbelievable things. If you are looking to replace your old thermostat, carefully compare the many thermostats on the market and then pick the one that will meet your needs the best. For many the Honeywell digital thermostat will be the best choice, giving them great flexibility and reliability in one thermostat.

http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

http://www.fixya.com/support/r3623083-thermostat_wiring_terminal_designations

on Jan 15, 2010 | Heating & Cooling

1 Answer

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.

Dec 07, 2010 | Honeywell Heat/Cool Thermostat

2 Answers

My Honeywell thermostat does not heat the house to the selected temperature. It will come on but not long enough to heat the house to the temp I selected.


Verify that you have heat coming from the vents.
Also do you use a heat pump system with electric emergency heat?
It may be that if it is to cold outside that the heat pump can not handle the load due to the cold outside and you will need to turn on the emergency heat.
Keep me posted.

FlaTech.
Thank you for using FixYa!

Nov 17, 2009 | Honeywell Heating & Cooling

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Bryant-Carrier Furnace Fan Stays On


I suspect a bad fan relay or bad fan control. Maybe the longer the control or relay is in the on position the more chance of it sticking on.

Oct 17, 2009 | Bryant 462AJC021BA Air Conditioner

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My thermostat quit working


Does it have batteries that need replacig. I think so. good luck.

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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

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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

Replacing Round Honewell Mercury Thermostat


try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

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