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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need. Please be patient as many times we work with several customers at once.
So if no air conditioning, what are you trying to turn on? Heat, blower?
Have you checked furnace for power, tripped breaker, perhaps blower door not on tight?
Just post back here when you're done. On the furnace, I would also check for a blown fuse on the control circuit board. The fuse is a 3 amp, most likely, and looks like an automotive fuse.