I have a Honeywell VisionPRO TH8000 series thermostat which is about 2 years old and what I find is happening is when I arrive home and I find that that the thermostat has gone into revovery mode which always seem to be 78 degrees from the programmed 80 degrees. I thought that first it was a power spike, but it seems to happen more often and to me it should go back to the preset temperature of 80 degrees. The is nothing in the operating manual discussing "recovery mode". Anyone have any ideas what might be causing this issue? John OB

The issue is probably not the thermostat. The thermostat is a series of switches that turn on and off in respect to the temperature. Since it takes batteries and installing those made no difference there is a chance that a relay is stuck in the furnace or the thermostat. I have attached the testing and installation guide for you to look at. Honeywell VisionPRO TH8000 Series Installation Manual Installer System Test

sounds like keypad is programmed in lock position read manual for set up to activate keypad again.

http://www.completeheating.ca/manuals/VisionPro%208000.pdf
Try the screen button and clean your screen in the given time.
also try honeywell.com/yourhome and use the contact us. They will try to walk you through and fix the problem as an ac company will usually just try to sell you another. These are not cheap stats I use one myself, I've have mine for years. I know it isn't much but hope this puts you in the right direction.

This site has owners manuals for different types of thermostats. http://yourhome.honeywell.com/home/Products/Thermostats/7-Day-Programmable/VisionPRO+8000.htm
This site is the manual for the "VisionPro 8000". You can look up what you need, copy or download. http://customer.honeywell.com/techlit/pdf/PackedLit/69-1894EFS.pdf Roger

Try setting the fan to Auto.

how to un hold a thermostat

The thermostat has a function called "Adaptive Intelligent Recovery".

This feature allows the thermostat to learn how long the furnace and air conditioner take to reach programmed temperature settings, so the temperature is reached at the time you set. For example: Set the Wake time to 6 am, and the temperature to 70°. The heat will come on before 6 am, so the temperature is 70° by the time you wake at 6.

You can turn off this function. Download the installation guide at the next link:
http://customer.honeywell.com/honeywell/ProductInfo.aspx/TH8321U1006
and look for funcion number 0530 Adaptive Intelligent Recovery. In this manual you also find the way to do a reset with the function number 0710.

I hope this solves your problem.

In the set up mode are you sure the lock was not turned on. The set up mode has a different book for the installer. Do you have the book if not check with Honeywell or let me know.

ac only?r and y

try holding the filter button in for three seconds, if that doesn't reset the timer try the filter button and the temp. up button at the same time for three seconds.