Question about Honeywell Programmable Thermostat Heater

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Sorry, I just typed a problem with the programable thermostat. The wires that come out, are green, blue, red, and white. I connected them to G, B, R &W, yet no heat. The heater has 3 zones, and the other 2 zones are working, so I don't think it is the heater. Any ideas.

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Check the zone valve for replacement

Posted on Nov 29, 2008

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Wires don't match the new thermostat posts. The wires from the furnace are Red,Blue black and white The posts in new thermostat are B O G Y not used R and Rc Can't figure which to put


The wire colors are for the following functions ......red - 24 volts white - heat yellow - AC green/blue - blower (fan) red is connected to the R with a jumper between R and Rc What type of furnace/heat do you have ???? Electric. oil, gas .Forced hot air, baseboard, steam, heat pump, or ?????? Different systems use different connections and need a specific thermostat for that application !!!

Dec 13, 2014 | Heating & Cooling

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I am replacing a White-Rodgers thermostat with a Hunter 44155C and dont know where to connect the wires. I have white, red, green, blue, and yellow wires and none are labeled as to what they are.


The Yellow wire is for cooling, the white is for heating, the red is for power, the green is for blower fan, the blue is your common wire, all you should have to do is color code the wires to the thermostat. The thermostat should have the colors labeled R,W1,G,Y,B or C for common if it's wired correctly at the Air Handler or evaporator. The blue wire should go to B, or C.

May 28, 2011 | Hunter Fan Company 5/1/1 Programmable...

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...

1 Answer

The thermostat (I installed myself) is not working. I have no heat. It's a combination heat/ac. I read instructions. I'm thinking maybe I have a wire connected wrong. before I go any further, I'd like to...


Wiring color to Thermostat Depending on what thermostat youhave and existing wires. Typically red and white are for heat and yellow andgreen are for cooling. On base of thermostat there should be initials stampedto identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most usesyou need to jumper these two together. You may have a blue wire instead ofyellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

Jan 09, 2011 | Heating & Cooling

1 Answer

I need wiring manual for goodman mini split.


outside unit L1 and L2 are load (input 240vac)
then you have control voltage, usually yellow and blue (24vac) this connects to some 18/2 thermostat wire which goes inside as white and red.

note: this unit may only need 24v control which is 2 wires from the inside unit and also 3 wires 2 hot 1 ground for line voltage.

STANDARD WIRING
on the inside unit you have green, white, blue and red control wires.

on your thermostat you have white, red, yellow and green

you run the wire from the outside unit to the inside unit. then run a 18/4 wire to the thermostat if wired and join the following wires.

inside unit thermostat outside unit
green------------------------green
white-------------------------white
red----------------------------red
blue-------------------------------------------------------blue
yellow--------------------yellow

Oct 08, 2009 | Heating & Cooling

1 Answer

I'm installing a Honeywell RTH7600B programmable thermostat and replacing a Honeywell T87F2873. The new one calls for a Red, Green, White, and Yellow wire, while I only have a Red, Green White and Blue....


Every thing the same except take your blue wire and replace the yellow for it. So when you hook it to t-stat goes like this

Red to R
White to W
Green to G
Blue to Y


Jan 16, 2009 | Heating & Cooling

1 Answer

Thermostat wiring


L is for a common wire if t-stat does not use batteries then this wire will have to be connected

Jan 13, 2009 | Honeywell Focus 6300B 5-2 Days...

4 Answers

Replacing thermostat


What is the blue hooked up to now?

Jun 07, 2008 | Honeywell Electronic Programmable...

2 Answers

Changing out home heating and cooling thermostat


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.

Dec 17, 2007 | Honeywell CT87B ROUND HEATING&COOLING...

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