Question about Honeywell Programmable Thermostat Heater

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Problem with Honeywell RTH230B Thermostat

The wiring was originally set up that way Yellow - Y, White - W, Green - G, with Red to Rc, and Black to Rh. Those are the only options I have with the Honeywell RTH230B (only 5 spots). Could the Yellow or White or Green wires be wired incorrectly and they should be going to the Rc or Rh spots? If so how would I be able to tell?

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  • pstamm May 31, 2008

    Originally when I purchased the tstat there was a jumper wire between the Rc & Rh spots. However in the instructions it mentions that for a 5 wire system, the jumper is not needed. It was working fine for heat with all 5 wires connected, however now neither the heat or cool are working.



    The system is a York Heat and A/C unit.



    I've since found the old jumper and replaced it, using the Red wire then the Black wire in the Rh position still with no luck.

  • Buck Whyte
    Buck Whyte May 11, 2010

    RC and RH are for the fan control so usually it is jumpered togehter.  RC-cooling RH-heating..I find that strange unless you have seperate fans for heating and cooling.. tell me what kind of system you have... heater and ac

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I have my temp on C and I need to change back to F I have the RTH230B programable

Posted on Jun 07, 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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