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No 24 vac on yellow or compressor thermostat terminal in heat or cooling .

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Turn the thermostat to off and check for 24vac between R and C or R and Y. If you don't have it then locate the transformer and check for power on the transformer primary side (120vac). If you don't have power on the primary side, check for a tripped breaker or blown fuse. If you do have it then the transformer is bad. You can confirm that by measuring the resistance of the secondary side of the transformer.

Posted on Nov 07, 2010

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Color code for theromstat


Wiring Examples and Instructions
How-To-Wire-It.com
Basic or Common Connection Points
Terminal Colour Signal-Type Description C Black 24 Vac Common Common side of 24 Vac Transformer See Diagram below R or V red 24 Vac Transformer Power Power side of 24 Vac Transformer See diagram below RH or 4 red 24 Vac for heat 24 Vac power before heat switch see diagram below Rc Red 24 Vac for cool 24 Vac power before cool switch see diagram below Y Yellow switched power (cooling) Signal to turn on cooling system see diagram below W White Switched power (heating) Signal to turn on heating system see diagram below G Green Switched power for fan Signal to turn on fan (forced air) see diagram below
Heat Pumps/Multi-Stage Units
Terminal Colour Signal-type Description Y2 Can vary Switched power (2nd stage cooling) 2nd stage cooling signal to compressor W2 Can vary Switched power (2nd stage heating) 2nd stage heating/ sometimes used as emergency heat E Can vary Emergency heat enable Dedicated emergency heat 0 Orange Reversing value Reversing dynamics of the heat pump ----

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1 Answer

Where is the low voltage 24 vac transformer located?


The transformer is located in the furnace. You might want to check to make sure the furnace door is on correctly brcause theres a swich that will open for safety . Also some have a fuse on the solid state board.

May 26, 2014 | Rheem RASL024JEC-RHPNHM2421JC 2 Ton 18.50...

2 Answers

How to wire contactor on Sears ac condenser style 36LC-000087CR


The contactor for the compressor and outdoor fan is activated by your thermostat when you call for cool. The small coil is an electromagnet that gets 24VAC when you call for cool at the t stat. The red wire in your T stat connects to the blue (or sometimes yellow wire) in the t stat completing the 24VAC circuit and closing the contactor. The line voltage is supplied to the poutdoor fan and compressor upon the contactor closing.

You can manually pushthe contactor close and the outdoor fan and compressor should start. Do this with your hand on the insulated portion of a screwdriver and take the tip of the screwdriver and push the contactor closed. The compressor and outdoor fan should start. That tells you that you have a thermostat to contactor coil issue if the t stat does not close the contactor when you call for cool.

Aug 03, 2011 | Heating & Cooling

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

    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

    I tring to change thermosat I can not remeber what color go where


    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 | Heating & Cooling

    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...

    1 Answer

    Trying to figure out thermostat wiring diagham on a split system


    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 05, 2010 | Heating & Cooling

    1 Answer

    I have a mobile home with just heat but the air cond come with it


    You will now need a 4-wire thermostat as well as 4-wire thermostat cable since you now have cooling in addition to heating. The 4-wire cable should have a red, green, white, and yellow wire. Some cables have a blue wire in place of the yellow wire. The red wire, which is 24 volts hot, goes on 'R' terminal. The green wire, used for the indoor fan, goes under 'G' terminal. The white wire, used for heating, goes under 'W' terminal. And the yellow or blue wire, used for cooling, goes under 'Y' terminal.

    Aug 05, 2009 | Heating & Cooling

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