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Honeywell CMS921 t/stat lost all display after batteries went flat, can it be restored.

Partial numbers showing, heating now comes on since new batteries were fitted but you can't see the temp or time.

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Posted on Jan 02, 2017

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SOURCE: Thermostat - Honeywell Chronotherm III

What you can do is try and clean the contacts. Open the door on the thermistat and remove the two screws, after that you can seperate the part that is mounted to the wall and the front panel. Look at the part that is mounted on the wall and you'll see the contacts that should be a copper color. They might be black from age. Clean them and you'll be surprised how well it will work after that.

Denis

Posted on Mar 15, 2009

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SOURCE: Central heating on all the time!

The zone valve needs replacing.

Posted on Sep 26, 2009

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SOURCE: EEE display code error on CT3600 Honeywell

I am a honeywell dealer and this stat is obsolete and no longer supported. I am not able to pull any info on this. It might be time for a new one.

Posted on Oct 07, 2009

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I took the battery out and then replaced it and the watch started to function properly again!

Posted on Oct 15, 2009

shastalaker7
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SOURCE: Bryant-Carrier Furnace Fan Stays On

Hi, you have replaced the stat several times, and adjusted the anticipator so its not the stat.This is a split gas/elect unit, and working on these for many years and looking at some of the solutions given, they are right.You need to be looking at the Furnace fan control.Units of that age they do tend to stick open and run constantly.I doubt its the fan relay, maybe if you were in the cooling mode.Fan controls are not that expensive. You probably have a Honeywell 7" to 11" Probe, with the auto/manual button, with a temp dial to set you're on off temps. I would inspect the heat exchanger for any signs of cracks or bulging being its that old. If you find any, you are looking at carbon monoxided and should be thinking about an upgrade soon.Also flame roll out.I am thinking of you're safety is all.If you do have this type of fan control, there is a tab that has to be cut before you install for 24v. control.It comes set for 120v. and will burn out all of your 24v. componants.Those old Bryants will run for years. Good Luck!
Shastalaker7

Posted on Nov 14, 2009

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2 Answers

Wiring with only 2 wires; which terminals to connect?


See RC and RH, RC is for cool, RH is for heat, you wire the red wire to the RH or red terminal ,either one will work actually but we generally switch the hot leg of power, W is the heat circuit


wiring-only-2-wires-terminals-connect-cp4yufdp500qfugpjpa1ch44-2-0.jpg

Dec 12, 2013 | Honeywell Electronic Programmable...

1 Answer

I replaced an old mercury T-stat (York with model number 2TH11704024) installed a new T-stat (RTH6350). The wires that I I have are O (orange), G (green), Y (yellow), T (gray but not used in new T-stat),...


Did you shut the power off to the air handler/furnace...... before you installed the new thermostat??? You may have shorted out the transformer or blown the transformer fuse...... If you try to put the Fan switch on the stat to Fan ON does the fan come on ..... if it does the transformer is OK.. On the new thermostat did you program it to tell it that you had a heat pump system ???? Looks like you had it wired right. Here is a pdf manual for a RTH6350 http://customer.honeywell.com/techlit/pdf/PackedLit/69-2416ES.pdf

Its on page 13 Advance setup for tell the new stat that you have a heat pump....There is also a Honey well Hot line on page 2 Hope this helps.

May 01, 2011 | Heating & Cooling

1 Answer

Our Honeywell programmable thermostat is close to 20 years old. Within the past week or so I have notice that while the program shows the heat should be at 68 degrees, the thermostat is reading as low as...


Good Morning, and yes you said it. Anytime a stat doesn't come on when it is set for a call for heat or cooling, the sensor on the subbase of the stat has lost its ability to sense the correct temperature. I have seen mechanical stats last as long as 25 plus years, but that's truly amazing for a digital stat to last that long. Yes, replace the thermostat. I don't know what kind of system you have, but if its a gas furnace with an a/c, the wiring will look like this. You will have terminals marked R, Red, for the 24 volt hot wire, G, Green, Y, Yellow, and W, White for heat. Going back to the red wire, it should have RC and RH on it. There will be a normally red wire connecting the 2 terminals.The Red wire coming in can connect to either one, as they are all together. The new stat will come with the new Red jumper wire attached. So, if you do have a gas heater, this is very easy to install. The only terminals you will need to use are RH to RC for the incoming red, Y, G, and W for heat. Y is for cool, and G is for fan. Very easy. Now if you have a heat-pump, they have many more terminals and can be a problem wiring them. If you have gas, forget the heat pump. I wont confuse you by going there. If it is a heat-pump, contact me in the comment box to let me know, and I can help you there also. Get a new stat at Home Depot, Lowe's Hardware, or O.S. Hardware. You want a 5 day, 2 day programmable Heating and cooling thermostat, 24 volts.It will have everything you need. See if it takes batteries for the display, they may not come with those, it will say on the box. Turn off your power to heater, so you won't short out the new one.They come in 2 sections, first the stat that just snaps on, and the subbase that is screwed to the wall. It will have the wiring terminals on it. Remove a couple of screws and loosen wires and remove. Be sure you write down how the wires go in case they used different colors, you never know. You will be all set. Store the manual in a safe place for future use. I wish you the best.
Shastalaker7
A/C, Heating, & Refrigeration Contractor.
PS, Please rate me on this :))
Happy Holidays to you and family!

Nov 23, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

After a power outage my T8011R display will not come on. Breaker is on and the auto fan works--so there is electricity to the thermostat. Is it fried or is there a reset or fuse that I need to address?


Hi, if the stat is working and running the fan, what has happened is the circuitry is faulty that shows the digital display. Before we are certain this has happened, check to see if the stat has batteries in it. Pull the front cover off and check. If it does, replace them and see if the display returns. If it does great! If not its the circuitry in the stat and will need to be replaced. Keep me posted.
Shastalaker7

Jan 17, 2010 | Honeywell Electronic Programmable...

3 Answers

CT3600 display went out. Replaced all 3


My honeywell CT3600 thermostat went blank.
Replaced batteries - no change ?

Dec 25, 2009 | Honeywell CT3600 7 Day Electronic...

1 Answer

EEE display code error on CT3600 Honeywell


I am a honeywell dealer and this stat is obsolete and no longer supported. I am not able to pull any info on this. It might be time for a new one.

Oct 01, 2009 | Honeywell Electronic Programmable...

1 Answer

HONEYWELL T87N 1000 ROUND THERMOSTAT


the power for that stat comes from the furnace - if you have no display on the stat you have a furnace problem

Sep 28, 2009 | Heating & Cooling

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