Good morning I have a honeywell programable thermostat and when I bought the house there was no instruction booklet. The heat is shutting off at night The furnace guy is coming sometime today and I will be charged a lot of money (which I don't) have if the problem is not with the furnace and I am sure it is the thermostat. I am sure it has something to do with the setting, I think I hit run program instead of hold the other day & I think it threw everything off. Help help help thanks elaine

should have 4 wires to thermostat. red to rh/rc. white to heat w1, y yellow to cool y, and green to fan

are you running a program?

I have put many of those in and yes, they are hard to program compared to the new ones. You will probably not find any instructions unless you go on line to honeywell and ask. Otherwise it may be worth your time and less head ache to just go get a new thermostat even the ones at Home Depot are a lot easier.

Hi,
If the thermostat is not over shooting the temperature than don't worry about it.
These thermostats are very sensitive and will turn the heat back on even before the degrees drop on the display. Often they will shut down before the display changes also. You can change the sensitivity of the thermpstat if you read the directions and change the cycles per hour to a less number. There is an installers program in there that you need to push a combiunation of buttons to get too. The instructions tell you how to do that also.

Hopefully you did not throw away the instruction manual for your t-stat.. :-)

Heatman101

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

The Thermostat Wizard is an interactive tool that will guide you through wiring and troubleshooting your thermostat, as well as programming it to the most comfortable settings for you and your family. Simply answer the questions from the Thermostat Wizard to correctly connect, troubleshoot and/or program your Honeywell Thermostat. You can even print the instructions and bring them right to the thermostat to help make things easier.
Go to: http://yourhome.honeywell.com/Consumer/Cultures/en-US/Support/Thermostat+Wizard/

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you have to configure the thermostat to run the fan when there is a call for heat. look at the installation instructions and they shoud ask you if it is gas or electric heat if its electric then you are gong to have to configure it to makr e the fan come on with the heat. Good luck

make sure fan on auto

something is wrong with the thermostat.  replace it first, that would be the cheapest alternative

Looks like it was replaced by the CM67 series, try this link for the manual:

http://www51.honeywell.com/pacific/common/documents/CM67_User.pdf

Geno