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Old 10-19-2009, 01:04 AM   #1
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cold setting starts heater on new thermostat


just installed a honeywell rth221 and when placed in the heat position, it heats and when in the cool position, it heats. Why can i not get cold air? Old thermostat was a lenox with R, Y1, G, O, W1, C,. New thermostat has only Y G on one side and Rh, Rc, and W on other with removable jumper connecting Rh and Rc.
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Old 10-19-2009, 04:35 AM   #2
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cold setting starts heater on new thermostat


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just installed a honeywell rth221 and when placed in the heat position, it heats and when in the cool position, it heats. Why can i not get cold air? Old thermostat was a lenox with R, Y1, G, O, W1, C,. New thermostat has only Y G on one side and Rh, Rc, and W on other with removable jumper connecting Rh and Rc.
Do you have a heat pump? On the old t-stat, was there a wire connected to the O terminal?
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Old 10-19-2009, 07:41 AM   #3
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cold setting starts heater on new thermostat


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Do you have a heat pump? On the old t-stat, was there a wire connected to the O terminal?
yes there was a wire connected to the O terminal. but did not use it on the new thermostat.
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Old 10-20-2009, 04:26 AM   #4
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cold setting starts heater on new thermostat


You need a Heat pump t-stat. O is for the reversing valve.http://yourhome.honeywell.com/Consum...ek/Default.htm Look at the bottom of the page under compatibility.

Last edited by newtech; 10-20-2009 at 05:23 AM.
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