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My Honeywell PRO 3000 thermostat is not activating the cooling system when prompted.

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R==power w=heat y=cool g=fan remove the front cover to reveal the 4-wires and take a jumper wire from r-----to ---g ,to see if the fan operates. Then take the jumper wire from r----to--y, to see if the cooling system works outside, because when calling for cool, the thermostat is internaly connected to g--for fan.. Then if it kicks in, then you have a bad thermostat!

Posted on Sep 04, 2008

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