I have a honeywell rth7500d thermostat. i have the G Y W R hooked up and the thermostat is not on. i have a blue wire also not hooked up. it is not hooked up in the furnace either. should this be my 24 volt supply and where do i hook it up in the furnace?
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.
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Your thermostat should power on without a problem if it is battery operated, and even then, when you put batteries in it, it should still power up. Without knowing the exact model, the only other problem I can think of, the power to the thermostat is supplied by the furnace which is a common wire (usually blue) that is also hooked up to the C terminal on the thermostat. If there is a common wire hooked up, then you have to check if you have power to the furnace. If not, the problems could get more complicated. Hope this helps.
It sounds like the t-stat is programmed for a heat pump or you have a heat pump and the t-stat is programmed for a regular furnace....
Check out the manuals in the tip and go into the installer setup to change the t-stat to the proper programming for your system..
Open up the propane furnace and see what color wires are hooked to the gas valve or circuit board. If it has a circuit board, note which color is on the R terminal and W terminal, Connect the the thermostat the same way. Most likely the yellow wire powers your A/C so you can hook that one to the Y terminal.
Two wire hookup on the old thermostat tells me that it was set up for heating only. You will most likely need a modern thermostat. But in the meantime try this with the old one. The two red wires on the furnace are probably Rh & Rc. If so these can be put "together" on the R terminal on the old stat. The two W's on the new furnace are probably W1 &v W2 This is for first and second stage heat. You can put the two "together" on the W terminal on the old stat. Do not hook up the greens (blower fan wires). Do not hook up the blue wires (They would go to the Y terminal on a modern stat for airconditioning.
Who ever sold you the furnace should have offered you a new thermostat.
Hi soozankrayg! Your problem should be pretty simple. (assuming that it is a typical 24volt system) you should hook up the black wire to the "RH" terminal and the white wire on the "w" terminal. Make sure that you turn off the power to the furnace at the breaker or the furnace itself before attempting this. The reason for this is that you can cause a short and either break the fuse at the furnace or burn up the circuit board. This can happen very quickly and is very common when a thermostat is removed.
What kind of system do you have (furnace with heatcool, heat pum or boiler )? Is there a themostat there now. How many wires does it have. If you have a furnace and you have heat&cooling install red wire to r on thermostat white wire to w and green wire to g. The g wire is usually for the fan. If there is a thermostat there now the old one should have the same letters on the back by where the wires hook up. The color of the might be diffrent than the ones i used for an idea.
Does the furnace burners light? You could have a bad thermostat or a flame sensor. To check if it is thermostat turn power off to furnace take thermostat off wall take wires marked r & w and connect them together then turn power back on. If furnace comes on and stays on then you need a new themostat if not it is the flame sensor inside furnace. Also check furnace filter
If you have a forced air furnace with an air conditioner attached make sure you have a jumper wire between Rh and Rc. If the Bryant thermostat had a wire hooked up to C you do not want to hook this up to Rc. Just cap it off and put it back in the wall or disconnect that wire down in the furnace.