Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Honeywell Thermostat Lock Cover

I run a hotel that has hot water heat controlled by an older style mechanical (round) Honeywell thermostat that has a round lock cover over it. I have the proper key to unlock the cover but cannot remove it to change the temperature. When the key is engaged what next motion to remove the cover..

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  • Honeywell Master
  • 587 Answers

Go to honeywell.com
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.

Posted on Jun 01, 2010

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I have a honeywell T87K round thermostat (2-wires R and W). I just purchased a honeywell WIF 7-day programmable thermostat RTH6580WF. How do I install the new thermostat? Is it even possible?


Programmable is in unit nothing to do wire fto urnace two wires cut furnace on and off you should have instructions to use two wires with your instructions

Aug 18, 2015 | Honeywell T87K1007 Mechanical Thermostat...

1 Answer

Heating won't come on. The hot water is working.


I guess the first thing to determine is if the thermostat is actually calling for heat. Do you hear a clicking sound at the furnace when someone cycles the thermostat?

If you do, then the thermostat is probably fine and the issue is within the furnace itself.

Mar 03, 2011 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

IVE GOT A HONEYWELL T87A 3 WIRE THERMOSTAT MOUNTED ON THE WALL AND WHEN I WANT TO TURN ON MY HOT WATER BOILER I HAVE TO LOWER THE T-STAT SETTING INSTEAD OF INCREASING IT TO GET THE HEATING SYSTEM TO TURN...


I would switch to a two wire heating only stat It sounds to me like they have the boiler wired into cooling side. Do you also have to set switch on your t-stat to cooling or leave it on heating. Just curious. I would still go with two wire stat. Thanks.

Nov 11, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Ideal response 120 seems to fire up but burner light does not come on and boiler runs for a while and stops,no hot water or heating ???


If this an older style boiler remove thermostatwires
at boiler terminal board and put jumper between R and W, if boiler starts you have bad thermostat.

If it does not come on then it appers that you have
a problem with the spark ignition or glow coil is
bad

Jan 09, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

How do i change an old style honeywell room stat


Shut the furnace off for starters. Remove the old Thermostat. As you remove each wire write down what terminal it wen to.

Example:
Red wire usually goes to R-Power
Green Wire usually goes to G-Fan
White usually goes to W-Heat
Blue or Yellow usually goes to Y-Cool

Jan 04, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

St6400c thermostat wont run the central heating independantly


This does not sound like a thermostat problem. I would be looking for a zone valve or circulator pump problem.

Nov 05, 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

BOUGHT AND REPLACED A HONEYWELL ROUND THERMOSTAT AND THE HEAT WILL GO ON BUT WILL NOT SHUT ITSELF OFF WHEN THE TEMPERATURE GETS TO THERE. IT KEEPS RUNNING TILL I SHUT THE THERMOSTAT OFF. I FOLLOWED THE...


look at the old thermostat and in the middle of it theres a arrow that is pointing at numbers that is called a heat anticipator. then on the new thermostat make sure that its set the same.

Feb 21, 2009 | Honeywell CT87B ROUND HEATING&COOLING...

3 Answers

Furnace kicks on every 15 mins


fuanace may be oversized and is short cycling it heats up house to fast it is better when they run longer

Dec 06, 2008 | Honeywell Programmable Thermostat Heater

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...

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