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Trying to connect a honeywell rth230b to a 5 wire thermostat. unfortunately, mislabled some of the wires. can you help determine what wires go to what?

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Heres a page for most thermostat combinations/colors used

http://toad.net/~jsmeenen/wiring.html


its got the most common combinations


Posted on May 17, 2008

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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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