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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
Did you turn the power off when you were changing the thermostat? What is the brand and model of your furnace?
Well if you didn't turn the power off when you were replacing the thermostat then you probably blew the low voltage circuit fuse on the control board. I can't tell you more than that since that's not a brand I recognize. I'm logging off for the night. If you need more help tonight then just relist this question. If you don't have any more questions I'd appreciate a favorable rating.