Question about Honeywell Programmable Thermostat Heater

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I have Honeywell thermostat (RTH230B). The heat set works well, but cool set does not work. My air condition works well with my old thermostat. What's the problem. Thanks

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Do you have an Rh and Rc terminal on t'stat and do you have 4 wires coming into it?
If you do then you need to put a jumper wire from Rh toRc.

Posted on Sep 11, 2009

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