Question about Honeywell Programmable Thermostat Heater

1 Answer

Honeywell round thermostat Model #T87F continuously running

We have turned the dial "off", but the baseboards are still red hot and the furnace still runs. Since this is a manual system is there any way to shut it down and perhaps fix it? It is approx. 18 years old.

Posted by on

  • lmt1367 Feb 28, 2009

    Are the thermostat wires located on the furnace? How do you shut the zone valve?

  • lmt1367 Mar 01, 2009

    I just replaced the old thermostat with a brand new honeywell CT87N model, and the wires looked in good condition. I see the zone valve on the burner itself and can move it manually. There was a red wire that seemed to have come undone and I put that back in place on that zone. The baseboard is still hot, but I don't wan't to shut down the system as it is 19 degrees and snowing today! Thanks for your help!



1 Answer

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

You either have 2 thermostat wires bare and touching or a zone valve stuck open

Posted on Feb 28, 2009

  • Hokie Mar 01, 2009

    There are thermostat wires on your thermostat and they are only 24 volt and on the zone valves, if you dont have zone valves the wire would be directly wired to your primary control(the reset button box) or into the aquastat to run the circulator. Often people move a thermostat to paint or paper a wall and the wires are bare where they come out of the wall or you have the old mercury type and it isnt level. A zone valve usually has a small lever or arm that can be maunually opened,if you had service recently check to see if your tech left a set of jumper wires on the burner or in a relay



1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Wires don't match the new thermostat posts. The wires from the furnace are Red,Blue black and white The posts in new thermostat are B O G Y not used R and Rc Can't figure which to put

The wire colors are for the following functions - 24 volts white - heat yellow - AC green/blue - blower (fan) red is connected to the R with a jumper between R and Rc What type of furnace/heat do you have ???? Electric. oil, gas .Forced hot air, baseboard, steam, heat pump, or ?????? Different systems use different connections and need a specific thermostat for that application !!!

Dec 13, 2014 | Heating & Cooling

1 Answer

Burner keeps running and heat is coming out of my baseboards with thermostat turned off

Disconnect the thermostat. You can usually do that either at the furnace or at the thermostat.

At the thermostat, remove the cover and find the red and white wires. Disconnect one of them, and leave it in the air.

At the furnace, the thin wires coming out of the furnace go to the thermostat. Usually, there will be a place you can disconnect them.

Once disconnected, the furnace should stop. If it does, you need a new thermostat. If it does not stop, you are in serious need of some furnace repair.

Sep 24, 2013 | Honeywell Programmable Thermostat Heater

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 | Heating & Cooling

1 Answer

Installed a Honeywell Thermostat - Heat will only come on when you manually turn up the thermostat - it is not coming on by itself. We have put on a new regulator on furnace, a new box for the Thermostat...

Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Mar 09, 2010 | Honeywell (CT62B1015) Baseboard Heater

1 Answer

I have an older square mercury Honeywell thermostat in my apartment. Furnace works fine in the main house using same model Honeywell thermostat. There is no heat coming from the apartment baseboards. I...

should have 24 volts @ t-stat. if tis is a boiler system it could have air in the zone that stays cold. bleed the radiator out and this should get the heat into the area you want.

Dec 06, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

I want to replace programmable thermostat with old dial style

The terminals should be the same on both thermostats, except for C- common.
R- usually RED, goes to hot side of transformer,
W- usually WHITE, goes to heat
Y- usually YELLOW goes to outdoor unit
G- usually GREEN goes to furnace blower
Any of the other wires just cap them off you don't need them. If you have an Rh and Rc terminal instead of R and don't have them on the programmable then put a jumper from Rh ro Rc.
If you need more, then let me know what terminals you have on both t'stats and brand of furnace and AC, if you have a heatpump then there's more wires let me know.

Oct 13, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Wiring for a Honeywell RTH2310B

Go to
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions

Jan 10, 2009 | Honeywell Focus 6300B 5-2 Days...

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...

2 Answers

AC fan not blowing/ Honeywell T87F thermastat

ok heres a test i want you to do carefully remove the thermostat cover and you will see the 3 wires one is red the other one is yellow and a green one turn off the thermostat and remove the wire from thermostat labeled G and carefully touch it on the R terminal if fan turns on, thermostat is defective if it dosen't turn on there should be a fan section on control board that's defective

Jun 26, 2008 | Weather King 10AJA2501AH Air Conditioner

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

733 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heating & Cooling Experts

Bill Long

Level 3 Expert

588 Answers

Paul Carew

Level 3 Expert

3284 Answers

vance jones

Level 2 Expert

120 Answers

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

Answer questions

Manuals & User Guides