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

4 Answers

Replacing thermostat replacing my home thermostat with a honeywell focus pro 5000. my present thermostat has a blue,green,red,white,yellow wires. the new thermostat has hookup for green,white,red,yellow wire and a c for common. what do i do with the blue wire? does it connect to the c common plug?

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  • medvanrey Jun 23, 2008

    MY THERMOSTAT HAVE 5 TERMINALS OF WIRES,

    When I moved the lever to on position nothing happen, no power..

    The thermostat have 5 terminals, 4 colors as follows:

    GREEN..........1 wire

    YELLOW........1.wire

    WHITE............1 wire

    RED h is connected to RED c

    What may be the problem? PLEASE.

    What wires to test for power?

  • jv8404 Jun 23, 2008

    Me 2, everything is connected except the blue wire. My problem is that I cannot control the temprature. It will go up or down but will turn on.

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4 Answers

It was hooked to the blue terminal on the old 1 but the old one was not a programable

Posted on Sep 19, 2008

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YES THE BLUE WIRE DOES CONNECT TO THE C TERMANAL FOR COMMON

Posted on Sep 12, 2008

The four colors of wires, where or how do I install in the termostat?

Posted on Sep 03, 2008

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What is the blue hooked up to now?

Posted on Jun 18, 2008

  • KennyD1976 Sep 16, 2008

    irritating how no one answers WHAT WAS THE BLUE WIRE HOOKED UP TO ON THE OLD THERMOSTAT?

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On the back of your thermostat, you should have a R (Red), W (White), G (Green), Y (Yellow), and a C (Common). If you have a thermostat that also has a set up for a heat pump, you will have additional terminals, but you don't have to use them since you have a 4 wire, ( in case you do, make sure your thermostat is set up for 1 heat, 1 cool). Your wires are all color coded besides the blue. Red to R, Green to G, and so on. Your Blue wire is being used for Yellow which will go to the Y terminal. Blue is usually meant for a common, but with only having a 4 wire, that's the color that was used. Red is your power, Green is your fan, White is your heat, and Yellow is your A/C. Hope this helps clear some stuff up and good luck!

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What are you trying to wire up?
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R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
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Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
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1 Answer

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Y- yellow
B- O/B
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