Trying to change temperature settings on my Honeywell touchscreen 8320. I can get to 670 function but can't change 2 to to 1 or 0 to unlock the screen.Removed the 3 AAA batteries to reset-no luck

press and hold up and down arrows until screen changes. Function 1 should be changed FROM 0 to 1

The first link is operators manual.

The second is installation and contains the procedure to set many functions including the display temperature.

https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2577ES.pdf

See page 15 function set 14. This sets F or C temperature
https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-2578ES.pdf

hope this helps?

I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room temperature...it doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)

First try replacing the batteries. I have a slightly diff honeywell model and it takes 2 "AAA" batteries. The battery holder comes out the side of the unit, just press where it says press and pull out.

You will need the installation book that came with the thermostat. There is a way to enter into the programming of the thermostat from the home screen. From there, you will need to find what code is the temperature settings in the manual, they are usually all 3 digit numbers. Once you find the code for the setting your looking for which is the lowest temp for the thermostat, it will have a 75 to the right of it which you can set a lower number. Sorry I do not have the manual right now to just tell you exactly how, but hope this still helps!

here is a download for the manual on page 12 and 13 in English.
http://customer.honeywell.com/techlit/pdf/PackedLit/69-2380ES.pdf

Press the up and down button simultaneously from a few second till display changes and then on #1 set it to option 1 and that show be C.

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.

well back when i worked on honeywell controllers, you don't set differentials on thermostat you set the temperature and it has its own differentials like + or - 1 or 2 degrees to the set temperature they don't let you play with this setting, you set your temperature and it will maintain around that temperature you shouldn't need to change the differentials around that temperature as controller does what the heater needs to get to the temperature you require setting the differential closer to set temperature will make the unit cycle a lot more and coast you more and having it to far away can let the conditioned area start to get back out of comfortable range so they set these in factory and you shouldn't be able to change them as they are set to how it should work to wrok properly so i wouldn't change them even if you could!

Hi and welcome to FixYa. I am Kelly.

Suprizingly enough there is an abundance of manuals for your Honeywell Programmable Thermostat. Use this link and at the bottom of the page you can download any of the manuals.

http://customer.honeywell.com/Honeywell/ProductInfo.aspx/TH6110D1021

Just note that pop ups must be enabled to download the manuals

Printable Quick Reference Sheet (after download)
http://customer.honeywell.com/techlit/pdf/PackedLit/69-1778ES.pdf

Thanks for choosing FixYa,

Kellly

That is correct hold the override button and the + button for a few seconds. Then you will see it flash and you can change the temperature then