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Honeywell cm921 has only half the numbers displayed.

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

Posted on Oct 25, 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


Replace the thermostat.

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

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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