Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I'm trying to hook up a honeywell touchscreen thermostat and need to know what wires go where.

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  • carl carpenter
    carl carpenter May 11, 2010

    what are the color of wires and did you remove old tstat yet

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I have a vison pro th8320u and i cant get aux heat to operate also aux heat on will not come up on the touch screen.

Posted on Jan 10, 2009

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SOURCE: Install a digital Honeywell thermostat

What kind of system do you have (furnace with heatcool, heat pum or boiler )? Is there a themostat there now. How many wires does it have. If you have a furnace and you have heat&cooling install red wire to r on thermostat white wire to w and green wire to g. The g wire is usually for the fan. If there is a thermostat there now the old one should have the same letters on the back by where the wires hook up. The color of the might be diffrent than the ones i used for an idea.

Posted on Jan 18, 2009

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