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

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Can I connect heat direct

MY central heating thermostat is not working. the wires are green, yellow, white, red and blue. can i connect anytwo wires for heating to be turn on for tonight.

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  • virtualbest Jan 25, 2009

    Thanks. i have electric heating . I tried. first i connected red and white. but no fan. then added green. fan came on. but after waiting 10 min. there is no heat. just normal room temp air is coming out.

    could it possibly a heating system problem rather then thermostat problem. .

    the only wire left is yellow one.

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Yes if you have gas heat use r and w, if you have electric heat try that (R-W) FIRST AND IF THE FAN DOES NOT COME ON THEN ADD G. good luck

Posted on Jan 25, 2009

  • Todd Born
    Todd Born Jan 25, 2009

    you apparently don't have a heat pump because of the number of wires that you have. your right abiut the fact that after 10 nminutes you still did not have heat, it could be a limit thats bad or a sequencer that went bad. yoiu are going to need a service techniocian to do the repair for you.

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1 Answer

I am wiring a honeywell thermostat model number ct87n if I select fan on the fan runs when out on auto /heat nothing but if I put on auto / cool and adjust the dial to a low setting the hea comes on....


there is it all depends on how many strands of wire are in there, they start at 2 wire and go to i think 8 wire and maybe more.
The wires are as follows:
1. red = power to stat.
2. green = fan control
3. blue or yellow = ac
4. white = heat
w1 = 1st. stage heat
w2 = 2nd. stage heat.
i am on line if you have any questions. wally

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1 Answer

Honeywell RTH230B cooling problems...


I printed out the instructions for your thermostat. It looks like you should have the following.

There should be jumper wire between Rh & Rc

Red wire to Rh or Rc whichever is easier since there is a jumper. This is the hot wire and all the thermostat does is connect to route it to the components needed for heating or cooling.

Blue wire, tape it up and don't use it. There is no spot on this thermostat for it. It is only used on thermostats that are powered by the transformer.

White wire to W. Powers the heat relay

Yellow wire to Y. Powers the cooling contactor

Green wire to G. Powers the indoor fan relay

There is a black jumper on the back of the face plate. Look at section 2.4 Setting J2 Jumper in the installation instructions. Make sure you have it in the right position for what you have. If you don't have them just google them.

Hope this helps.

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1 Answer

Need wiring diagram for Honeywell RCT8100


The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

Apr 02, 2010 | Honeywell Electronic Programmable...

2 Answers

RED BLUE GREEN WHITE ARE THE FOUR WIRES THAT I HAVE TO CONNECT. PROBLEM IS THAT I FORGOT TO (AND I KNOW BETTER) MARK WHERE EACH CAME FROM TO PUT BACK IN THE RIGHT PLACE -- USED TO HAVE A DEHUMIDIFIER NOT...


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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1 Answer

How do you wire a honeywell round mechanical thermostat


What are you trying to wire up?
Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
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1 Answer

I have a coleman Evcon model AH16-0 . I am


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Jan 06, 2010 | Heaters

1 Answer

Hi Proper way on wiring furnace.


I can give you a start, For heat only, R terminal on furnace to Red wire to R or RH terminal on thermostat. W terminal to White wire to W terminal on thermostat. G terminal to Green wire to G terminal on thermostat. This will get you heat but not air conditioning.

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2 Answers

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2 Answers

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Yes, the blue or yellow are interchangeable. they are for the cooling mode. Just first make sure the white is heat, green is fan and red is the power 24v.

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