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Once I set my thermostat can I lock it out to prevent it from being changed? I have a Honeywell RTH4300B.

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no you cannot lock this t-stat out. but you can buy a lockbox to go around it at your local hardware store. here is a link to the instruction booklet if you dont have it linkhttp://www.instructionsmanuals.com/modelo-5886-en-Thermostats.htm

Posted on Oct 30, 2008

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I couldn't figure out how to amend my last question, so here is one more piece of information. I just put batteries back in and reset the time/date. The Temp Up and Temp Down buttons WORK FINE


your thermostat may be locked go to honeywell web site punch in thermostat model # and look for set up pushing two button at the same time gets you in but you will need instuctions for set up

Jan 31, 2015 | Honeywell RTH230B 5-2 Day Programmable...

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Honeywell thermostat


Honeywell has made a huge number of thermostats over the years. Directions for each are specific to each model. Your model number will begin with the letters, T, TH, RTH, C, or CT and is on the back of the thermostat.
Once you have the model number, you can obtain the owner & programming information by supplying it on the Honeywell webpage, here.
If you are having trouble, either contact Honeywell directly - or repost here.
Good luck!

May 16, 2013 | Air Conditioners

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I bought a Honeywell RTH8500 thermostat and I can't get the temperature to go down past 75 degrees


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!

May 28, 2012 | Honeywell Rth8500d 7-day Touchscreen...

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My thermostat is not working. It might be locked. It's blinking with all of the information it holds flashing on the screen. The part number is: tstatccnhp01-c My heat is no longer working. Can you...


Instructions
  1. 1 Unlock a partially locked screen by pressing any locked key, which will bring up the "Screen Locked" message. Next press an unlocked key, which will likely be the temperature up and down arrow keys. This will unlock the screen.
  2. 2 Press the "System" key from the home screen. Five blank touch keys, flanked by the "Done" and "Cancel" keys, will appear. Hold down the middle key for about five seconds. The Advanced Settings menu should come up.
  3. 3 Change the User Setup Number, found in the bottom left of the screen, by pressing the middle arrow keys up or down. Set the number to "0670," the universal unlock code.
  4. 4 Turn to the arrow keys on the right side of the screen. Press the keys up or down to change your options. Selecting the number "0" will unlock the screen, while choosing "1" will partially lock it. You can fully lock your screen again by selecting.


Read more: How to Unlock the Screen on a Honeywell Thermostat ' eHow.com http://www.ehow.com/how_7667347_unlock-screen-honeywell-thermostat.html#ixzz19ktDWSq8

Jan 01, 2011 | Air Conditioners

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My honeywell thermostat (TH8321U) touchscreen's icons only work on the left side which enables me to turn might heat on and off but will not allow me to change my settings?


Better replace the thermostat.

And for details, plz visit to:

Honeywell thermostat website: http://yourhome.honeywell.com/home/Applications/SmartSearchResults.aspx?searchkey=thermostatfor heating b>

Dec 07, 2010 | Air Conditioners

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I have just moved home and we have a Honeywell CM61 Prog.Thermostat but no operating instructions.Can you help?


Push run program for a preset schedule, once in the schedule you can change times via up/down temp buttons, push next to set next schedule period and so on. Otherwise push hold temp or hold to overide the program and run as a regular stat, for more info 1800 honeywell or Google support.

Nov 01, 2010 | Air Conditioners

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How do I change the temperature range on a Honeywell TH8110u1003 thermostat. The range now won't let me go below 77 in AC mode.


Try adjusting the heat range up. Set it a 77 then try the cool.
I believe the Honeywells have a max range between cool and heat.
also sometimes there is a lock out code on them you'll need the book.
Good luck

May 20, 2008 | Honeywell Air Conditioners

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My visonpro Honeywell 8000 digital thermostat's screen is locked and I can't unlock it


Push the System button, then in the bottom row of empty buttons, press the middle buttton for 4 seconds. The display will change, showing system codes on left and that code's setting on the right.
Choose 670, and option 0 opens it up completely, option 1 locks it partially. You should not try to override settings the HVAC/Building admin has set for you, in case you are trying to defeat their control.

May 10, 2008 | Air Conditioners

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