Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Hot air does not come on

I am trying to install a Lux mechanical heating and cooling thermostat that has G, Y, W, and Red wires.

When I have the switches on Cool and Auto, and move the temp control to a low setting, it comes on just fine.

But when I have the switches on Heat and Auto, nothing happens.

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Common color code is as follows:
Terminal Wire Color
R RED
W White
G Green
Y Yellow or Blue

This does not guarantee your thermostat was wired to common color code. Assuming it is a single transformer forced air heating and cooling system the following is likely your problem there should be a RC & a RH termial on your new thermostat incase you need a split sub-base for multiple transformers. My guess is that you are connected to RC, if there is not a wire to RH the heat function will not work. the thermostat should have been supplied with a jumper to connect RC & RH together for single transformer applications. If not any small gage piece of wire will work, if I have assumed incorrectly please give me more info about your system.

Posted on Dec 18, 2008

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2 Answers

I recently installed a Honeywell RTH6350D to replace a 2 year old LUX and can get everything to work but the heat(reason for replacing the LUX). Works sometimes but not consistantly. Have the common red(R)...


R represents power supply for the heat system.
RC represents power supply for cooling system.
G represents fan (neutral).
W represents heat system.
Y represents cooling system.
Y2 represents 2nd stage cooling.
W2 represents 2nd stage heating.
AUX represents heat pump.
Try calling 1-800-468-1502.
Their english is "REALLY BAD"!!!

Jan 02, 2011 | Honeywell Electronic Programmable...

Tip

Lux Thermostat 500


The Lux 500 Thermostat is an affordable programmable thermostat that gives you a very easy way to customize your heating and cooling temperatures to your schedule. The programming of this thermostat is easily the simplest that I have found in a programmable t-stat.

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The Lux 500 series thermostats are a great economical way to reduce energy and utility expenses by raising or lowering your temperature settings a the times you set. The installation is so easy that most any DIY’er can install this thermostat. It has an easy to read display and the rotary dial makes the programming very user friendly.

A few of the other great features of this unit are, a keyboard lockout, and an air filter reminder.

This thermostat can be used on any 24v AC or 750mV single stage conventional heating/cooling system. Single stage heat pumps without auxiliary heat will also work with this thermostat.

Here is a summary of the features of this thermostat

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  • 5 - 2 Day programming
  • 4 Periods per day
  • Large easy-to-read display
  • LUX patented user-friendly Speed Dial®
  • Filter usage monitor and alert
  • Default Energy Star approved program
  • Temporary Temperature Override
  • Temperature Hold
  • Keyboard Lockout
  • Temperature Calibration
  • Swing Settings #1 - #9
  • Fahrenheit or Celsius temperature Scale
  • 12/24 Time Format
  • Low Battery Warning Indicator
  • Mercury Free


As you can see this thermostat will give you a lot of great features at an affordable price.

on Jan 16, 2010 | Heating & Cooling

1 Answer

Tempstar furnace when the thermostat is fan on the fan from the air compressor turns on not the air circulation fan in the bottom of the furnace


Y or yellow and G or green are connected in the "auto" setting, as G is fan and Y is cool, the Y and G wires are somehow, energizing the Y wire that goes to the AC unit to run cool, take thermostat off exposing the thermostats sub base Y and G will be there along with R, red, 24volt ("hot leg" of 24 v power) W white= heat, and C common, 24 volt ("neutral leg" or "common" leg of 24 power) common is where all the various 24 volt circuits (cool, heat, fan,) terminate or return to complete the circuit, just as a AA battery nas a positive and negative side of power, so does the furnace and all electrical circuits, its common as all circuits terminate there , its the opposite side of power fro whish all circuits begin, red is the :hot leg" and enters on RED red to WHITE=HEAT

RED to YELLOW=COOL
RED to GREEN= FAN

auto =Y & G connected
on= R & G connected

if you jump red to green, which is fan on, no connection should exist to yellow in on ! only auto!

May 27, 2010 | Heating & Cooling

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.

May 24, 2010 | Honeywell Electronic Programmable...

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
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Honeywell CT87B ROUND HEATING&COOLING...

2 Answers

MY HEATER BLOWS HOT AIR THEN BLOWS COLD THEN HOT THEN COLD,ICHANGED THE MOTHER BOARD, RELAY SWITCH, AND THERMOSTAT, IT IS RUN FROM A HEAT PUMP WITCH I HAD CHECKED AND IT WORKS FINE


I have a lux electric thermostat my furnace will blow out heat for about one hour to maybe three then it will start blowing cooler air,I then cut it off for thirty seconds or longer once I do that it will start blowing out heat again then it will repeat it self again what could be the problem.

Jan 07, 2010 | Heating & Cooling

1 Answer

Can't get new thermostat to work


When you have only 2 wires it is set up to run just a heater only. If this is a central heat/air unit, you would have 4, red for Hot, White for heat, green for fan, and yellow for cooling. sometimes they will have a blue wire that's not being used for a spare only.Some times you can use just the heat part of the stat if you connect the Red to r and if the subbas'e says Rc and Rh .If so, try connecting red to red and if it does say Rc and Rh that means red cooling and red heating.Run a jumper wire across the 2 reds along with the red from the wall. Connect white to w.Try programming the heat and see if it fires up. If not, you will have to replace stat with a 2 wire Heating only thermostat. Do not pull any wires up from the transformer as you will burn it out!! Just remember, 2 wires are for a heater only!4 are for heat and cool, and 8 are used for a heat pump.Sometimes the new stats have the red jumper wire in place and all you have to do is hook your red to either end of the jumper, and then white to W. If no RCand RH, get a heat only stat, or it will never work believe me, I know this.Good Luck and let me know if you need more help. Shastalaker7

Nov 07, 2009 | Heating & Cooling

1 Answer

I want to change to a programmable thermostat my old one is 8846 and i need to have a wire diagram in order to change wire or its a lr1620 might be the model


  • Red to the thermostat RH or thermostat RC terminal with a jumper wire between thermostat RH and thermostat RC. Or Red to the thermostat R terminal which is shared with both the heating and cooling. It has an internal jumper built in to the sub-base. The red wire is the source hot wire from the transformer. All other wires, except the common wire, controls a specific relay or contactor that energizes the fan, heating, or cooling depending on the selection. The following is the common wiring colors but your system may not be common and different colors could have been used.
  • Green to the thermostat G terminal. This is the color that controls the fan or the relay that control of the blower.
  • Yellow to the thermostat Y terminal. This is for control of the air conditioning.
  • White to the thermostat W terminal. This is for control of the heating.

Here is the link you can copy and paste in your browser: They also have every other model here to:

http://highperformancehvac.com/thermostats_2.html#new_thermostat_installation

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2 Answers

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On your thermostat - R is the power in terminal. Y is the cooling out. W is the heating out. (G is fan out). It does not matter which wire goes to R, the other should go to W - if no heat with a call, the thermostat is bad.

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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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