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

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

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

I never liked the user un-friendliness of the Chromatherm, I would suggest finding a thermostat that you can understand and operate. Yes the Chromatherm is a good one, but so damned hard to figure out. Stay away from thermostats that still use mercury. Good Luck!

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

Are you saying that the temperature over-shoots it's setting by 5 degrees? If so and if the thermostat has an inticipator device in it you can adjust it. After removing the cover on the thermostat, look for a little brass triangle on the lower right hand side. There will be a scale with numbers on it and they are very hard to see. This device heats up prior to shutting off the thermostat so it will not over-shoot by more than a few degrees. Move the brass triangle either up or down and let the heater cycle a few times. If the temperature swing gets worse, go the other way next time.

If the thermostat is not heat inticipated, there will be a small "Dip" switch where you can adjust to a specific degree of under-shoot.

Visit the Honeywell website and you can pull up the installation/owners manual for your model. www.honeywell.com