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The thermostat is just a low voltage on-off switch. There should be two small wires (assuming you are replacing an old unit) coming out of the wall. These could be any color combination. Connect one wire to each of the terminal screws inside the thermostat housing. Replace the cover and turn it to the desired setting. The furnace should now hum happily until set temperature is reached
The `R` terminal on the stat is for the powered wire from the furnace, the `W` terminal is the power back to the furnace to start it those are the 2 to use. If you have 3 wires the third one goes on the `G` terminal, that is to run the fan only if you have a subbase with fan switching (Auto/On) capability. Usually but not always all 3 of these wires will be color coordinated with their terminals (Red,White & Green).
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How do you turn furnace on without thermostat?
turn breaker off. unhook thermostat wire to furnace turn breaker on. worth a try; if it works you will have to turn off breaker to shut it down.
Why was power lost to a heat and air thermostat?
The power to the thermostat comes from the transformer in the furnace or air handler whichever you have. 1) the power to the furnace/AH is off, 2) the control fuse that protects the transformer is blown, 3) the transformer is defective, 4) the wire between the furnace and the thermostat got cut.
Replaced the thermostat and the furnace works but wont turn on?
Sounds like you might have a blown transformer, or a blown fuse on the transformer. Hope for the fuse. Its on the Furnace. Be sure your white wire is on the heat side of the thermostat, and the red wire is on the correct terminal also. The transformer can be checked with a voltmeter.
New furnace and thermostat now air conditioner compressor doesn't work?
If you replaced the furnace and thermostat this past winter, and now the A/C doesn't work. You probably just have a loose control wire. Check the yellow wire at the stat. It should be on the Y terminal. Next, look inside the furnace at the terminal block. The condenser wire should have two conductors. One hooks up with the yellow wire on the Y terminal of the terminal block. The other hooks to the C terminal. Always turn off the breaker to the furnace before working on any wiring. No need to fry the transformer.
Your payne furnace does not turn on when you move the thermostat?
i have a model 125u19 payne furnace i move the thermostat but nothing comes on in the furnace and the pilot light is lit
Is bell wire available at hardware stores?
Most local hardware stores carry bell wire. The big-box stores probably only carry the DIY wireless kits. A suitable replacement is furnace thermostat wire.
do you have to have a thermostat for an outdoor furnace?
Yes, a thermostat is required for an outdoor furnace. I recommend going to http://www.buycheapr.com/us/result.jsp?ga=us11&q=outdoor+thermostats for discounted thermostat.
Main burner on furnace burns all the time even with thermostat turned down a no electric signal to valve from thermostst?
Depends on what type of furnace you have but it sounds like 1.a wire from the thermostat is shorted, 2.the thermostat is stuck itself or 3. the main gas valve is stuck. Try turning the power off to the furnace next disconnect the wires leading to the gas valve if this stops it check 1 and two if this doesnt stop it then it is number 3
Divice for regulating furnace heat?
There is always a wall thermostat for regulating furnace heat.
5 wire thermostat to a four wire thermostat?
Dont connect the common wire.
How can you test thermostat in your furnace?
Set thermostat to desired temperature; lets say, 70 degrees Fahrenheit, a few seconds will go by then the furnace should activate. Once the furnace heats the room to the set temperature the furnace should shut off.
What size wire to use to install a thermostat?
Use what is called bell wire or thermostat wire.
