Changing Your Honeywell Thermostat

Save yourself a bundle

Honeywell Thermostat(80269)Credit: dreamakerHow to change your Honeywell thermostat is a comprehensive guide to changing out a defective Honeywell thermostat.

The basic function of all thermostats is to monitor the temperature in an area and turn equipment on or off with a rise or fall in the ambient temperature within the area. A simple task performed by a simple piece of technology.

Shut off all power to the heating system when performing this repair.

Most thermostats have color coded wires to help with the installation procedure. Normally red and white are used for a simple heating only thermostat. More complicated heating systems as well as systems that incorporate air conditioning can have as many as eight wires and these wires will also be color coded.

If you have a heating only system, then you'll be opening the front cover of the thermostat or in the case of a round Honeywell thermostat, popping off the outside ring. This will expose the screws that hold the thermostat to it's mounting base.

Once the base is exposed you will see the wiring for the thermostat. Count the wires and note the colors and locations on a piece of paper. Do this before proceeding. Trying to remember where they were isn't as easy as you may think.

Find the model number for your Honeywell thermostat and acquire a replacement of the same unit. If an exact model is available you may not have to unwire the base. Simply use the old base and fasten the new thermostat to it.

Most of the time the unit you get to replace your faulty thermostat may differ slightly. As long as it has the same terminals as the old one it will work.

Find the new base and make sure you have at least all the terminals the old unit has. Unscrew the old base from the wall and after making notes for position and color, remove the wires from the old unit.

Follow the instructions for your particular Honeywell thermostat and fasten your new base to the wall. Now connect the wires exactly as they were hooked up on the old thermostat.

Extra wire should be pushed into the wall so it will not interfere with the installation of the Thermostat and any cover plates.

Snap the top cover onto the base and you can now test the operation of your completed job. If your equipment works then you have just successfully saved hundreds of dollars calling a serviceman.


Honeywell RTH7600D Touchscreen 7-Day Programmable Thermostat
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(price as of May 24, 2014)