Question about Honeywell Programmable Thermostat Heater

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A/C won't kick on w/ Honeywell RTH230B

I switched out my old digital thermostat (Blue Dot factory one) for the Honeywell RTH230B programmable one. My old one has W,Y,O(Not in use),R,C,G and the new one has W,Y,G,Rh,Rc. I put the wires as follows W-W,Y-Y,R-Rh,C-Rc,G-G but my AC will not come on. The heat works fine as I tested it out but the AC symbol blinks as stated in the instructions for compressor safety, but when it goes solid the AC should kick on and it doesn't. I put my old one back up and it works fine. I've done the porcess twice trying to trouble shoot and make sure everything is secure and correct w/ no luck. What could be going wrong?

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Make sure you jumper R to rh. Russ

Posted on Jul 31, 2009

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Page 26 27 of the users guild states that thermostat has a fail safe preventing one system to turn on immediately after the other system has been on say you turn on heater to test then try to turn on cooling to test well cooling wont turn on immediately to prevent damage to system..

Posted on Feb 21, 2015

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Rh-24v heat Rc-24v cool
take your red wire hook it to Rh and make a jumper to Rc Rh & RC - R
C should go to a common if you want to power the tsta without batteries
check the installation instructions to see if there is a B-terminal see if that is the common

Posted on Jul 30, 2009

  • t1m130
    t1m130 Jul 30, 2009

    Rh-24v heat Rc-24v cool

    take your red wire hook it to Rh and make a jumper to Rc Rh & RC - R

    C should go to a common if you want to power the tsta without batteries

    check the installation instructions to see if there is a B-terminal see if that is the common

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