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

1 Answer

I installed a new Honeywell C87N today. All went well, no probelms with the installation. The reason I changed the one I have was the heat just never stops running. This never happened before and just the other day it starting working in this manner. I doesn't shut off even if I put it on off the thermostat still keeps running. We live in a Condo and the furnace is in a separate building. The change didn't make any difference accept that it is new. Please help. The only way I an get ir to shut off is to trip the breakers.

Posted by on

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
  • 706 Answers

Hello brandaleepup,
Your problem may be at the furnace control end and not your thermostat. To determine that, simply unhook the two wires from your thermostat so that they do not make contact. When they are electrically opened like that, your furnace should shut down. If it doesn't, then the problem is at the furnace control board. You may have a relay that is staying on even when power to it is disabled.
Hope that helps...
Regards,
Rick

Posted on Nov 28, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Had new heating installed an got honeywell thermastat .weet to put heating on today for firsf time heating wont come on


If it was changed during the cooling season, the first thing I'd check would be for a jumper between the Rc and Rh terminals on the thermostat sub base. If not there, install a short jumper to power the heat side of the system. If there IS a separate wire on each of the Rc and Rh terminals, you have to check to make sure there are TWO transformers in the circuit, one for heating, one for cooling. Most new systems are NOT set up this way, but there a few dinosaurs out there. If there ARE two transformers, do NOT connect the jumper or one of the transformers will immediately burn out. If there ARE two, proceed to troubleshoot the heat side of the control circuit. Look for a secondary fuse or tiny circuit breaker, loose or broken wire on Rh, W1 on t-stat or in furnace. Then call a service tech....If you are not capable of performing the above, call the tech first.

Aug 10, 2014 | Honeywell Heating & Cooling

Tip

Honeywell RTH7500D Thermostat


This Honeywell thermostat is a good medium priced thermostat that will give you many bells and whistles at a very good price. The programming is very easy to do and of course the thermostat is very reliable also.

4351a52.jpg

The installation of this thermostat is very easy and if you need help with the installation you can go here to see the complete installation guide.

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2221ES.pdf

If you have lost your owners manual and need a copy of it you can go here

http://customer.honeywell.com/techlit/pdf/PackedLit/69-2222ES.pdf

With the help of these .pdf files you can get all the information that you need to install and troubleshoot your RTH7500D thermostat.
If you are replacing a thermostat make sure that you turn off power to your heating or air conditioning system BEFORE you start removing any wires. Failure to do so could cause you to burn out the 24v transformer of your system. Also make sure to mark all wires well before removal so that you know which wire went where and so that you can reinstall the old thermostat as it was if something goes wrong with the new installation.

For heat pump systems you WILL have to make some programming changes to the thermostat to get it to work with a heat pump system. Most all thermostats come programmed for conventional systems. This reprogramming is not difficult but is required for proper operation.

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

http://www.fixya.com/support/r3892721-programmable_honeywell

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

on Jan 16, 2010 | Heating & Cooling

1 Answer

Honeywell visionpro


Um...., you changed the controller and it worked, then put the old one back and it doesn't work >> replace controller!

Oct 16, 2013 | Honeywell Electronic Programmable...

1 Answer

Honeywell YTH9421C1002, heat pump puts out cool air in heat mode


You have the stat programmed incorrectly or wired incorrectly there are alot of settings for installers in that stat and all of them have to be set correctly

Apr 05, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

Flashing battery symbol


I had this same problem today.  I called Honeywell and they said the flashing broken battery symbol may mean low batteries, or it may mean the battery type is incorrect.  They recommend only non-rechargeable alkaline batteries.  I was using rechargeable NiMH batteries.  Even though they were fully charged, I had the flashing battery symbol and the thermostat relay would not work.  I replaced with alkaline, the flashing battery indicator went out, the thermostat works again.
Odd that it worked for 3 months on the rechargeables after first install. I did notice the broken battery symbol came on after the first few days, but I checked the battery charges and they were good, so I disregarded the symbol until the thermostat stopped working today.  Apparently there is something about the NiMH performance characteristic that the thermostat doesn't like.

Jan 31, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

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.

Jan 05, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Thermostat auto-changeover mode unavailable


when you programed it did you go through all the setup #1-0 ,#3-0 ,#5-5 ,#12-1

Nov 24, 2008 | Honeywell Electronic Programmable...

3 Answers

Honeywell deluxe programmable thermostat 69-1402m


Solution #2 as above worked (thank you very much!) to get to the programming mode, but on mine keeping Function #13 on the default setting of "0" maintained the AIR.  Toggling the Temp button to "1" changed the system to conventional on/off at the programmed times.

Oct 16, 2007 | Honeywell Programmable Thermostat Heater

Not finding what you are looking for?
Heating & Cooling Logo

174 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

587 Answers

paulcarew

Level 3 Expert

2364 Answers

Brandon Berry
Brandon Berry

Level 2 Expert

407 Answers

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

Answer questions

Manuals & User Guides

Loading...