Question about Honeywell Programmable Thermostat Heater

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My CM921 is displaying a room temperature of 38 degrees, this does not reflect the actual room temp', the only way we can get the heating to fire up is to set the target temp' to a higher temp' - heating then comes on, the problem is this incorrect reading on the thermostat, can anyone help please ?

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Move the t/stat

Posted on Mar 02, 2019

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Centigrade?

Posted on Feb 24, 2019

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Posted on Jan 02, 2017

  • 3 Answers

SOURCE: 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

Posted on Feb 12, 2009

  • 603 Answers

SOURCE: I have a cm921 thermostat with the correct

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.

Posted on Mar 16, 2010

SOURCE: Hello, I have recently had

Hello Try RAISING the temp setpoint in COOL mode,sometimes there is a deadband so unit will not conflict.

Posted on Sep 23, 2010

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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

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