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I'm replacing my wall thermostat. The old thermostat was programmable and there are 3 wires coming out of the wall; Red, Blue, & White. The thermostat I'm putting in is not programmable and connections (2) are marked W and G. What goes to what?

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Its got 3.... Find the r==red--or power..OK.

Posted on Sep 08, 2008

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The best way is to see where the wires are connected at the furnace and duplicate them at the thermostat but typically the connections are:
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From the two red and two black wires (and the specs in the pdf), your new thermostat sounds like it's designed to directly control the line voltage (120 or 240) to the heater. That's the usual way baseboard heaters are controlled.

Could your wires be red, black, and (old, yellowed) white, the standard colors in a 3-wire power cable? Just the red and black should be enough to control a 120-volt heater so I don't understand what the white would have been used for. If it were my heater I'd take off the cover(s) -- with the power off, of course -- and find out what those wires actually connect to.

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Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.

The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.

Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.

This should also be stated in the instruction manual.
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