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I'm trying to change the thermostat and hook up the wires but the heat does not turn on How do the wires need to be hooked up?

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  • Anonymous Jan 17, 2009

    IM TRYING TO CHANGE MY THERMOSTAT BUT THE OLD ONE HAS 7 WIRES AND THE NEW ONE ONLY HAS HOOK UPS FOR 5

  • Perry Putnam
    Perry Putnam May 11, 2010

    What kind of system do you have?(heat pump, gas furnace and A/C)

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  • 306 Answers

Here is the basic wiring diagram for a gas furnace thermostat

Red wire to R terminal
White wire to W terminal
Green wire to G terminal
Blue or Yellow to Y terminal


Posted on Jan 17, 2009

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They don't always use the correct wire colors,if it is labeled w it is for your strip heat,shouldn't hurt to hook it up,most likely they used it for the strip heat,most heat pumps are wired to turn on your strip heat when the heatpump is in defrost mode and it is controlled by the heat pump,you can hook this to the emerg. heat or w2 :)

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You will need to go to the heating system and see what color wires are hooked to that. Typically the black and white wires will be used unless they used another color due to a bad wire. Hook the colored wires to the R or RH terminal on the thermostat and the other wire to the W terminal. You can also try taking the wires you have and one by one twisting them together and have a second person inform you when the heating system turns on. Take those two wires and hook them to the terminals I mentioned above.

Jan 14, 2010 | Honeywell Programmable Thermostat Heater

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I tried to insatll my new honeywell programmable. the old t-stat had a white and red wire connected allread. there were 3 other wires unused, G,W,R. I hook up the original R,W wires to the new t-stat and...


The red and white wires go to the R and W terminals on the thermostat. Disconnect what you have now and hook the red wire to the R terminal and the white wire to the W terminal on the new thermostat and see what happens.

Jan 09, 2010 | 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


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

Dec 10, 2009 | Honeywell Programmable Thermostat Heater

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Our fan for the intertherm p3ra-024k will not shut off. We have put new wiring from thermostat to unit. He pulled the green wire like the serviceman told him to when he serviced it and it still keeps...


You have a problem with the wiring somewhere it could be in the thermostat. When the service man said pull the green wire off that was the power to the fan. The thermostat should wire up as red to the R terminal on the thermostat this is the 24 volt feed to your thermostat and to the unit. The white wire should hook up to the W terminal on thermostat. This white wire is to the heating section of your furnance it activates the heat mode. The yellow wire hooks up to the Y terminal on the thermostat this is the outside condensing unit control for the a/c. The green wire should hook up to the G terminal on the thermostat this is your fan wire that activates the blower in your furnance If this wiring isn't hooked up as such then your problem is in the wiring from thermostat to units inside and out. Also if you have changed the thermostat you need to be aware of the setting for the thermostat and the type unit you have. Most thermostats are universal however, you need to make sure that on the thermostat the setting for heat pump on the thermostat it will have a small switch and on switch will have hp at the top and nonhp at the bottom. If you have a heat pump you need to make sure that the setting on the thermostat is on hp if not a heat pump nonhp is the setting. Also there will be a switch that has g at the top and e at the bottom This is you gas or electric heating seletor switch make sure this switch is in the proper position for either gas or electric heat. Good luck on your repairs Hope this helped

Dave

Nov 02, 2009 | Intertherm P3RA-024K Air Conditioner

1 Answer

Six wire hook up and new thermostat has only 5


Some thermostats have an extra terminal for an outdoor sensor which tries to anticipate the need for heating or cooling. If this option is not present, you will have an unused terminal which may have a shorting link to a neighboring terminal. Your installation instructions should mention this if the option is or is not included with your model. Also, heat pump systems vary in the system control voltage and not all thermostats and systems are compatible with the more common split system thermostat.

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


W- White (heat)
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May 07, 2009 | Honeywell Heating & Cooling

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Letter designations for honeywell tsats R=24 volt power, W=heat, Y=cooling, G=fan, C=common wire for the 24volt power to tstat. Generally R is the red tstat wire and so on. Blue tstat wire can be hooked up to common at the tstat. On the heater the blue tstat wire would be hooked up to the C terminal. But this also depends on the manufacturer of heating unit.

Jan 22, 2009 | Honeywell Programmable Thermostat Heater

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