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

Feb 22, 2011 | Honeywell CT87B ROUND HEATING&COOLING...

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I have 5 wires red,white,green,blue and yellow, but i dont now how to instale those cables please show mi how do it.thank you


This is if you have gas furnace and central air conditioning.
Normally this is the way.
Red wire to R (or if your stat has Rc and Rh, wire to both of these
White wire to W
Green wire to G
Yellow wire to Y
Blue wire to C
If you want to check, before you connect to stat. Connect red and white (heat should come on)
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Yellow to Y (Air conditioning) Blue to C (common)
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R-Red is power
Y-Yellow is cool
B-Blue is cool as well
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If you have no indoor unit and this is a ac/gas or
electric outdoor unit try this.

R to R/Red to Red
G-G/Green to Green
Y-Y/Yellow to Yellow
W-W/White to White
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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)
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Rh = Blue One side of (inside) 24 volt (inside transformer)
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R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
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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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C- Blue (Common 24v)
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O/B (Only needed if system is a heat pump)

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