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I'm replacing my wall thermostat. The old thermostat was programmable and there are 3 wires coming out of the wall; Red, Blue, & White. The thermostat I'm putting in is not programmable and connections (2) are marked W and G. What goes to what?

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Its got 3.... Find the r==red--or power..OK.

Posted on Sep 08, 2008

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The old one has 2 black wires, 1 red wire, 1 blue wire, 1 green wire and 1 white wire. what do I do?


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More than likely, this is what you have:

Red- Power- (RC/RH)
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Usually, the only times you need more than 4 wires are:

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Can not figure out how to wire it so ac works i have only 4 wires coming out of wall blue red white and yellow


Here is a general wiring solution:

Red is hot on a 24 v system, Red goes to "r" on thermostat
White is heat, goes to "w" on the thermostat
Yellow is aircond and goes to "y" on thermostat
Blue is fan and goes to "g" on thermostat

* note: this is typical and could not be 100% sure without pictures of the unit

Apr 11, 2011 | Heating & Cooling

1 Answer

I bought a honerwell regular digital thermostat and changed it trying to follow directions the 4 (four) wires coming out ofn wall and that were connected to old thermo were red, black, yellow and white. ...


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 05, 2011 | Heating & Cooling

1 Answer

I bought a Hunter 44155C programmable thermostat to replace my Carrier non-programmable one. The wiring on the carrier is: W- white wire O- no wire G- green wire R- red wire C- blue wire Y- yellow...


Hello,You need RH/RCjumper together=red wire...C=blue wire...G=green wire...Y=yellow wire...W=white wire...O/B unused for reversing valve for heat pump.Hope that helps. : )

Nov 10, 2010 | Hunter Heating & Cooling

1 Answer

I have a Rheem Gas Furnace with an old analog thermostat (Wires conneected to terminals R and 4 for the thermostat). I went to install a Rheem digital and programmable thermostat and it indicated that it...


if you have 2 wire at thermostat Terminals at furnace that the thermostat wire attach to should be R & W if your new thermostat has R & W terminals is should work, an easy thing to remember is the red wire on R the white wire on W. If 4 wire at thermostat at furnace green on G, Blue on Y, red on R,and white on W same at thermostat If these do not match find a thermostat with these terminals

Dec 06, 2009 | Heating & Cooling

3 Answers

A duo therm thermostat (p/n 3105058) was removed because it would not operate the air conditioner/heater in a firan fireside camper. it was knocked loose from the wall damaging it.the thermostat is for use...


a. Remove the cover of the thermostat.
b. Connect the RED wire from the air conditioner
to the “RC” terminal on the thermostat.
c. Connect the “YELLOW” wire from the air conditioner
to the “Y” terminal on the thermostat.
d. Connect the “BLUE” wire from the air conditioner
to the “H” terminal on the thermostat.
e. Connect the “ORANGE” wire from the air conditioner
to the “G” terminal on the thermostat.
f. Push the thermostat wires into hole in wall and
fill excess hole with insulation.
g. Mount thermostat base to the wall with screws
provided.
h. Check all thermostat wires on base to ensure
they are completely clear of the bimetal coil of
the thermostat. Adjust if necessary.
i. Replace thermostat cover.
If nothing operates on the air conditioner, remove the
return air grille assembly and verify the red, orange, yellow
and blue wires are properly connected (red-to-red,
orange-to-orange, etc.).
Next, disconnect the red wires and check for 12 volt
DC between the red wire from roof section and the orange
or blue wire from roof section. If no voltage received,
refer to Section F2. If voltage is received, the
problem lies with the thermostat or thermostat wires.
Next, disconnect all 4 wires (red, orange, yellow and
blue) from the thermostat. With the thermostat set on
COOL mode, FAN mode set on AUTO and HIGH, and
temperature selector set lower than the room temperature. Check for continuity between terminal RC (red wire)
and terminal G (orange wire); and RC (red wire) and
terminal H (blue wire). If continuity is achieved on each,
proceed with the next step.
Set fan switch to LOW. Continuity should NOT be present
between terminal RC and Terminal H, but present between
the other terminals (Y & G) and terminal RC.
If all of the previous checks are good, the thermostat is
good, do not replace it. If any one of the previous checks
are not correct, replace the thermostat.

Jun 15, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I need a wire diagram of a central heat and air with a heat pump


W- White (heat)
Y- Yellow (condenser)
G- Green (Indoor fan)
C- Blue (Common 24v)
R- Red (24VAC)
O/B (Only needed if system is a heat pump)

May 07, 2009 | Honeywell 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

Replacing the thermostat, took the old one off without marking the wires. Hooked it up by color and we get the furnace when we put it on cool. wires are green, red, yellow & blue (ground wire)on the...


the normal wiring for stats is white=w=heat,red=r=24volts,green=g=fan,blue=c=common,yellow=y=cooling.
see what ties into your furnace board and match the terminals.

Aug 12, 2008 | Honeywell Heating & Cooling

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