Question about Honeywell Programmable Thermostat Heater

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Honeywell RTH230B So I bought a new Thermostat and have tried many different wiring configurations to get this thing to work and nothing seems to be right.  The old thermostat has 7 wiring posts.  G - Y - W - RH - RC - RC - B - O There is a short piece of wire that connects the Y to the W. And there is also a short piece of wire connecting the RH to the RC.  There are 4 wires coming out of the wall. Green to the G. White to the W. Red to the RC and Blue to the O.  The back of the thermostat I bought has RH - RC - W - Y - G The manufacturer of the old Thermostat which works sometimes is Alaskan AC and they want to charge me $250 just for a new thermostat. I just bought the house in october and I can't see spending that much on something that should cost 80 bucks or less.  I live in Arizona and it is starting to get hot!!!  Please help me.  SamIam

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  • Anonymous Feb 15, 2009

    My old Thermostat burned up last night. While attempting to replace it with a Honeywell RTH2310B I can't get the AC or Heater to come on.

    The old Thermostat had 6 wires/connections: W-O-G-R-C-Y the new one only 5. The instructions for the new one stated not to use the C. I hooked up the wires to the same letter connections and no joy.

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Jumper RH to RC and Y to W (Just like the old thermostat) and hook the cable wires as you have indicated with the exception of the blue wire - clip it back - it is not needed. This is a heat pump system so heating and cooling are done by the same unit. RH stands for Red Heat, RC for Red Cool, the W and Y are the neutral sides to the heat and cool control circuit. That should get you going good enough to start learning the intricacies of programming the box.

Posted on Jun 02, 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.
Hope this helps.

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