Question about Honeywell Programmable Thermostat Heater

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Problem with Honeywell RTH230B Thermostat

I have purchased Honeywell RTH230B thermostat. When the set point temperature is lower than the actual temperature, the fan will be working if I set it to auto. If the set point temperature is higher than the actual temperature, it will not work, it sounds normal for the cooling. But the temperature would not decrease into my setting point…. What is it wrong with it? Does anyone know how to help me?

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  • pstamm May 29, 2008

    Running into similar problem with Honeywell RTH230B, however Heat worked fine, now A/C won't turn on.



    Wire colors from wall: White, Yellow, Red, Green, Black

    Connections on tstat: Rh, Rc, Y, G, W



    What is the correct wire to connection combination?

  • mojokes Apr 25, 2009

    Old thermostat is long gone and I've forgotten the terminals and where things were hooked up.

    Honeywell t-stat terminals: Rh, Rc, W, Y, G.

    My five wires: Red, Black, White, Yellow, Greed



    The heat worked fine all winter. I turned the A/C on today and I get nothing. I imagine my problem is related to my Black, Yellow, and Green wires. Is the black even needed? I can't get a voltage reading across the black and yellow wires, which are connected into Rc and Y, respectively.



    Do I need to ditch the black wire and put a jumper between Rh and Rc?



    Oh....natural gas furnace if that matters (remember, heat works).

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Sounds like you have it wired wrong..   Pop the top off and give me to color of the wires and tell me which letter each color wire is on.. that will tell us right away if you have it wired wrong

Posted on May 27, 2008

  • Buck Whyte
    Buck Whyte May 30, 2008

    ok correct wiring with the stat you have is.. 


    white to W
    red to rh or rc there should be a small jumper that runs between rh and rc
    yellow to Y
    green to G
    NOW the black wire is a question mark... there should be a 6th position on your stat with a B stands for blue.. MOST techs use this diagram.. but may not have had stat wire and used telephone wire.. seen this many times..


    Hope this helps

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My wires are as follows.red,white,black,green.where do you put the jumper cable
my model no. is honeywell RTH230B and old model..I don't have the color blue or yellow in this thermostat

Posted on Oct 14, 2011

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SOURCE: thermostat won't keep furnace fan running

You probably have a loose or broken wire to the fan relay. Check the wires on the thermostat first. Pull up on the bottom of the thermostat to remove it from the wall plate. You should see several screw terminals and the conductor wires that should be connected to them when you look at the wall plate. Check if any of the wires are disconnected or broken. If a wire is broken, strip a portion of the unbroken section of the wire and secure it to the appropriate screw. (The fan relay terminal is G for most setups.) If none of the wires are loose or broken, then you have to check for damage to the wires between your heating system and the thermostat or at the heating system. It could be a bad wire going to the jumper on control board or damage to the board itself.

I hope this helps. If the problem is not at the thermostat, you may need to have a professional diagnose and fix the problem. However, if you post additional comments about your heating system, Fixya experts may be able to help you diagnose the problem.
Cindy Wells
(we had the broken wires at the thermostat keeping the fan from working in the past. It's an easy fix if you are willing to handle small wires carefully.)

Posted on Jul 06, 2013

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Posted on Jan 02, 2017

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