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

1 Answer

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!

Posted by on

  • 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??

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 579 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Digital thermostat Honeywell RTH 2300 - compressor runs when in heat mode


Check thermostat wires maybe to long and touching in the back of the thermostat

Mar 21, 2013 | Heaters

Tip

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.

915d979.gif


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.

fddbfa4.jpg

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.

fba228a.jpg

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 | Heaters

1 Answer

Honeywell programmable thermostat - was installed per instructions in manual and now the furnace runs non-stop unless I move switch to "off." The old (round mercury switch) thermostat was wired red t


If you are unsure about which wire goes where, that may be the source of your problem. The color coding can be confusing when changing from old to new. I pulled the instructions for my Honeywell CT3400A thermostat and found you can call Honeywell Consumer Services at 1-800-468-1502 M-F 7:30 am to 5 pm CT

Mar 11, 2013 | Heaters

1 Answer

How to wire Honeywell thermostat RTH7500 from old Weathertron GE


You have a control board on your furnace, there is a 3 amp fuse there, that 3 amp fuse needs to be replaced. You most likely touched a wire even by accident and blew the fuse. You will have to remove the door \panels to get at it. It looks like a normal car fuse

May 31, 2010 | Honeywell Electronic Programmable...

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 Heaters

1 Answer

How to use a round circular honeywell thermostat? I turned round casing to mark heat , no heat on??


If you turned the ring and the pointer moved, then you are using the thermostat correctly. Turn the thermostat up above room temperature (the temp on the bottom of the thermostat) Make sure all your switches are on, and that the fuse or circuit breaker is also on. If you still do not have heat after verifing all these things, then it is most likely a problem with the heating appliance.
Also, if it is a heating and cooling thermostat, make sure your lever is in the heating mode. Hope this helps

Sep 17, 2009 | Honeywell CT87B ROUND 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

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.

Oct 23, 2008 | Honeywell Electronic Programmable...

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...

Not finding what you are looking for?
Heaters Logo

Related Topics:

1,415 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heaters Experts

Sean

Level 2 Expert

77 Answers

Gareth Cockram
Gareth Cockram

Level 3 Expert

657 Answers

yadayada
yadayada

Level 3 Expert

60769 Answers

Are you a Honeywell Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...