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I switched my thermostat to save money but now it is 85 in my house and it constantly is running but it is hot all the time my dad put it in so i know its right what is wrong with it

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It may be wired incorrectly. Make sure that the compressor is being called to run when you set the ac to cool. The Green wire to T-stat makes the indoor fan run when you set the T-stat to cool...also the Yellow wire should signal the contactor to engage at the outside condenser and compressor unit. If this is a heat pump system there is usually an orange wire that will signal the reversing valve to move when cool is being called....normally the reversing valve is in the heating position in the event there is a failure to the solenoid that actuates it..thus leaving it to fail in the heat mode to provide heat in winter weather as a default. Make sure the new T-stat accomidates for your units wiring.

Red wire to R (24v supply from transformer)
Green wire to G (indoor fan)
White wire to W (call for heat)
Yellow wire to Y (call for cool)
Blue or Black wire to C (common)
Orange also to Y if not specific to t-stat (calls for reverseing valve in cooling mode)

Posted on Oct 13, 2010

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