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Re: I had an old thermostat that i had to change need...
Go to honeywell.com
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The old thermostat has a second stage heat which is W2. The new one doesn't have second stage heat.
The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.
http://customer.honeywell.com/TechLit/pdf/69-0000s/69-1717.pdf that is the best I can give, as wiring is dependent on the type of equipment that you are controlling with the thermostat. Be sure to cut your power supply off before you start or you'll need a new transformer and a wiring diagram for your furnace too.
What is the wire on the old control.....what terminal is it on??....When replacing old controls the new ones often have different terminals and sometimes incorporate some terminal internally etc....the Wiring Diagram included should be followed exact....if it's working fineit's likely ok....if you have any doubt have it looked at by an expert
It is technically possible use a 2-wire thermostat with a 3-wire zone valve, but you need a single pole, double throw relay like a fan control relay with one normally open switch and one normally closed switch. 2-wire thermostats only have one switch that is normally open. 3-wire thermostats have two switches......one switch that is normally open, and one switch that is normally closed. The fan relay lets the 2-wire thermostat simulate a 3-wire thermostat. It's possible, but usually it's easier to just get a 3-wire thermosts.
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
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:
your old thermostat is a milivolt and the wire runs from the heater to the thermostat. You have to open the back of the new one and connect the wire as per the instructions on the wireing diagram that came with the new one. I just installed a similar one myself, you will be very happy with it.
If I understand your post correctly....You state that you are hooking up a 240v heater and towards the end you speak of removing jumpers...W2 terminals..ect. It sounds to me your trying to us a 24v low voltage thermostat instead of a Line voltage thermostat.That's what I'd take a look at.
Are you saying no lights on the control board light up as well? If so, check the door switch, Emergency switch, breaker and lastly, the power to the furnace. If you can see a light but the system is not working, check for any error code (flashing) and look at the wiring diagram on the back of the service door. Also, there is a small fuse that you may want to inspect. If you do have a light on, jump out R and G on the control board and make sure you push in on the door safety switch. Let us know what you discover!