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Honeywell cm921 it comes on but half numbers are missing and does not work right i have changed batteries

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Replace the thermostat.

Posted on Dec 12, 2013

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Honeywell cm921


Unfortunately, you will have to replace the thermostat. You can try removing it from the base plate (if available) for at least 10 seconds after removing the batteries, but I have never seen a display reset and correct the problem you are having.

Nov 25, 2013 | Heating & Cooling

1 Answer

Honeywell cm921 has only half the numbers displayed.


a new thermostat is needed. Someone probably banged it. replacing it will be easier and cheaper for you

Oct 22, 2013 | Heating & Cooling

1 Answer

CM921 LCD figures breaking up


Hi There - I have a similar problem to the one described by yourself . Did anyone offer any help or assistance on this at all ?
Many thanks
M Hudson

Jul 15, 2013 | Honeywell Programmable Thermostat Heater

2 Answers

The wifi connection from worcester boiler to room thermastat Honeywell Cm921 , boiler not receiving signal


Can't help you directly, but Honeywell will have user instructions on their website.
It's something like holding the 'stat within a metre of the boiler when the batteries are inserted. Best to RTFI.

Jan 27, 2013 | Heating & Cooling

1 Answer

We have a honeywell cm921 and we cant set the therm astat to come on in the mornijng and then go off then come on again in the afternoon on timer please can you help


Your CM921 has 6 built in temperature settings based on time of day:

1 - 6:30 AM
2 - 8:00 AM
3 - 12:00 PM
4 - 2:00 PM
5 - 4:00 PM
6 - 10:30 PM

meaning that at 6:30 AM the themostat will change its temperature setting to setting 1, at 8:00 AM it will change the temperature setting to setting 2, and so on. To schedule temperature settings which best fit you, determine which time periods you would like more or less heat.

For instance, to fit what you requested in your question you could program a temperature you would like to maintain in the morning and afternoon times when you would like it to be on, and in the time periods in between set a lower temperature as follows:

1 - 20C
2 - 16C
3 - 16C
4 - 20C
5 - 20C
6 - 16C

With this example your thermostat would turn on at 6:30 AM as long as the temperature was below 20C and maintain that temperature until 8:00 AM. At 8 it would change its setting to 16C allowing temperature to drop from 8 AM to 2 PM to a lower setting to conserve energy until afternoon time when the setting would change back to 20C from 2 PM to 10:30 and then change back to 16C to save energy throughout the night. The actual temperatures would be at your discretion based on your individual comfort level.

Pages 5 and 6 of the following link will guide you in setting each of the 6 temperature settings.

http://www.wolseleysbc.co.uk/_STEPData/Assets/Honeywell%20CM921%20Room%20Thermostat.pdf

I hope this helps. Let me know if you have any additional questions.

Dec 10, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a cm921 thermostat with the correct batteries showing full charge. Yet the battery light is flashing and says battery low. Also displayed room temperature is a lot higher than the actual room...


HONEYWELL WEBSITE:
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.

Feb 28, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell thermostat CM921, how to set the heating for a 6.30am??


if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times

Sep 02, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell CM921 Showing room temp at -24 degrees, How do I reset?


Heya this is a manufacturing fault from honeywell them selves when it comes up -24 basically it needs to be replaced there is no way around in if you get in touch with honeywell they are generally good about it also if you provide them with the date code and model code they will be greatfull as it seems they have sent out a "bad batch". you locate this by:

A) Move the slide in to the off position
B) Press and hold i for 5 seconds
C) Unit will enter settings mode
D) Press and hold the i button and the + and ¿ button together
E) The unit will hold the relay on for 5 minutes and you can view by pressing the down arrow twice for model id/date code (ww/yy)

I hope this helps

Nov 11, 2008 | Honeywell Programmable Thermostat Heater

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