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Q I installed a new thermostat and my heating or cooling does not come On, why?

A The thermostat may not be seated on the back plate. Remove the thermostat and re-install it being careful to insure the plastic clips on the top are engaged before pushing in and latching the bottom. Also check for a plastic strip with a bar code on it on the part that the wires attach to, if you have one remove it. Last try fresh batteries.