Question about Honeywell Programmable Thermostat Heater

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2 wire thermostat heat only...how do i hook it up...i have a g wire, an rc, a w and a y and an r which are jumped ,,,,,,help

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R and W jumped out will turn the furnace on this is usually what you need to hook up on the stat
Regards Greg

Posted on Dec 15, 2009

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1 Answer

Change from old lennox thermostat to honeywell 5000


no offense but you need some new a.c. guys. what if they were hired to do this job, would they say they couldn't do it? we need model numbers of tstat and indoor unit to help, obviously these colors go to the same components your new tstat will control!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Oct 29, 2017 | Honeywell Electronic Programmable...

2 Answers

I paid $20 last night to talk to someone. He told me how to hook up the Lux DMH110 but when i hooked it up this morning the heater came on when i put it on COOL and the fan just come on when i put it on...


If you have this type of system your thermostat will not work;
  • Multi-Stage Heat Pumps
  • 3 Wire Hydronic Systems
  • Line Voltage Systems (120/240 VAC)

  • This thermostat is only for this type of HVAC systems;
  • Most 24V Heating and A/C Systems
  • 1 Stage Heat/1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump Systems
  • 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator)
  • Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces)

    1. Never connect a low voltage thermostat to line voltage.
    Two wires control a heat only system.
    1. Connect one wire to W and the other to RH.
    Two wires control a cool only system.
    1. Connect one wire to RC and the other to Y.
    Three wires for forced air heat only system, where the previous thermostat
    did not have a clock or timer.
    1. The previous RH or RC wire is the 24-volt transformer wire. Connect it to RH. Leave jumper connecting RH to RC. Connect the forced air heat system to W, and the fan wire to G.
    Three wires for a heat only, forced
    water system that did NOT have a
    clock or timer.
    1. This system employ 3 wire zone valves. Currently no Lux controls are compatible with this system.
    Three wires control a heat only, forced water system that DID have a clock or timer.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W.
    Four wires control a heat only system,
    and two of the wires operate clock or timer. The other two wires operate the heater.
    1. Tape off and do NOT install any clock or timer wire. Often they are labeled C or TC. Install the remaining two wires, one to RH and the other to W. The jumper connecting RH to RC may remain or be removed.
    Two wires control heating AND cooling.
    1. Currently no Lux controls are compatible with this system.
    Three wires control heating and cooling. One wire operates heat, one operates cooling and the third provides 24 VAC.
    1. Connect the 24-volt power wire to RH. Install a jumper connecting RH to RC. This jumper is usually pre-wired. connect the heat wire to W, and the cooling wire to Y.
    Three wires control a cooling only system. One wire operates the compressor, one operates the fan and the third provides
    24 VAC.
    1. Connect the 24-volt power wire to RC. Connect the cooling wire to Y and the fan wire to G.
    Four wires control a heating and cooling, electric, gas or oil, forced air system that
    is NOT a heat pump.
    1. Connect the 24 VAC transformer wire to RH or RC. Install a jumper connecting RH to RC This jumper is often prewired. Connect the heat wire to W, the cooling wire to Y. and the fan wire to G.
    Four wires control a Single Stage Heat Pump. They were labeled: G, Y, R or
    RH or RC, With either B or was used.
    1. Do not connect wires to both B and O. Connect the reversing valve wire to B or O, just as the previous thermostat. Install a jumper wire from RH to RC. Connect 24 VAC wire to RH too. Install a second jumper wire from W to Y. Connect compressor wire to Y and the fan wire to G.
    More than 4 wires are connected to the
    old thermostat

    Jun 27, 2010 | Heating & Cooling

    1 Answer

    Replacing thermostat what to do with single red wirew/bridge?


    yes u leave the bridge intact and just put ur red wire to r or rc and usually they say rh and rc that is for a 2 transformer system which obviously u dont have so leave the wire intact jumped and hook ur red wire up yellow is ur ac wire white is ur heat wire and green is ur fan wire and red is ur 24 volt hot wire all a tstat does is jump that red wire to white for heat green for fan or yellow for ac but make sure ur power to ur unit is off before u change wires or u risk touching wires together and burning up transformer

    Feb 24, 2010 | Honeywell Programmable Thermostat Heater

    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 | Heating & Cooling

    1 Answer

    I am trying to hook up a Hunter 44260 t-stat. The old one(not sure of model) has the following hookup. White-O Terminal Green-G Terminal Red-RC Terminal Yellow-Y Terminal then jumped to W Terminal...


    Here is some basic info to help you. On the thermostat the letters mean... G is for your blower fan, and is usually green, Rc and Rh are power for the heating and cooling circuit (24v) and are usually red; Y (or in this case Y/O) is power to the cooling contactor (outside the house) and is usually yellow, and W (or in this case W/B) is the common wire, and is usually white. It kind of sounds like the people who installed the old thermostat followed these guidelines, so your best chance is to go to the heating unit and seeing where the wires connect to. Hope this helps

    Jun 16, 2009 | Hunter Fan Company 5/1/1 Programmable...

    3 Answers

    Honeywell RTH3100C


    You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to www.honeywell.com if youve lost them.

    Dec 13, 2008 | Honeywell Programmable Thermostat Heater

    1 Answer

    Honeywell RTH230B


    Jumper RH to RC and Y to W (Just like the old thermostat) and hook the cable wires as you have indicated with the exception of the blue wire - clip it back - it is not needed. This is a heat pump system so heating and cooling are done by the same unit. RH stands for Red Heat, RC for Red Cool, the W and Y are the neutral sides to the heat and cool control circuit. That should get you going good enough to start learning the intricacies of programming the box.

    Jun 02, 2008 | Honeywell Programmable Thermostat Heater

    3 Answers

    Honeywell RTH230B


    Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.

    The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.

    Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.

    This should also be stated in the instruction manual.
    Hope this helps.

    Feb 03, 2008 | Honeywell Programmable Thermostat Heater

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